A car is moving on a city street at a speed of 30 km/h. The driver...
A car is moving on a city street at a speed of 30 km/h. The driver sees a red traffic signal ahead and slams on the brakes, providing an acceleration that has magnitude 6.0 m/s2. The driver's reaction time is 0.50 s. (a) Determine the displacement of the car until it stops. ___m (b) Repeat Part (a) if the initial speed is 60 km/h and the braking acceleration is the same as in Part (a). ___m
Homework Answers
Total displacement is equal to the displacement travelled during the reaction time plus while deceleration.
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A car is moving on a city street at a speed of 30 km/h. The driver...
The speed limit in a school zone is 45 km/h. A driver traveling at this speed...
The speed limit in a school zone is 45 km/h. A driver traveling at this speed sees a child run onto the road 20 m ahead of his car. He applies the brakes, and the car decelerates at a uniform rate of 11.0 m/s2. If the driver's reaction time is 0.55 s, will the car stop before hitting the child?What is the stopping distance of the vehicle?
A truck is traveling at a constant speed of 56.6 km/h . Suddenly, the driver sees...
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The driver of a car traveling on the highway suddenly slams on the brakes because of a slowdown in traffic ahead. A) If the car’s speed decreases at a constant rate from 74 mi/h to 50 mi/h in 3.0 s, what is the magnitude of its acceleration, assuming that it continues to move in a straight line? Answer is in mi/h^2 B) What distance does the car travel during the braking period? Answer is in ft
The driver of a car is initially moving at a constant speed of 66.2 km/h when...
The driver of a car is initially moving at a constant speed of 66.2 km/h when a traffic light turns red. If a 0.510 s reaction time is required before the brakes can be applied, what is the distance in meters traveled by the car before it begins to slow down?
The driver of a car is initially moving at a constant speed of 73.9 km/h when...
The driver of a car is initially moving at a constant speed of 73.9 km/h when a traffic light turns red. If a 0.535 s reaction time is required before the brakes can be applied, what is the distance in meters traveled by the car before it begins to slow down?
The driver of a car is initially moving at a constant speed of 73.9 km/h when...
The driver of a car is initially moving at a constant speed of 73.9 km/h when a traffic light turns red. If a 0.535 s reaction time is required before the brakes can be applied, what is the distance in meters traveled by the car before it begins to slow down?
The speed limit on a particular city street is 45 miles per hour (which is 20...
The speed limit on a particular city street is 45 miles per hour (which is 20 m/s). A driver approaching a stop light slams on their brakes, locking the wheels of their car in place so that they no longer rotate. If the coefficient of friction between the car's tires and the street is 0.9, what is the minimum distance the driver would need to start braking in order to stop before the intersection?
11.78 A car is traveling at a constant speed of 54 km/h when its driver sees...
11.78 A car is traveling at a constant speed of 54 km/h when its driver sees a child run into the road. The driver applies her brakes until the child returns to the sidewalk and then accelerates to resume her original speed of 54 km/h; the acceleration record of the car is shown in the figure. Assuming x = 0) when t = 0, determine (a) the time t, at which the velocity is again 54 km/h, (b) the position...
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The driver of a car slams on the brakes when he sees a tree blocking the road. The car slows uniformly with acceleration of −5.00 m/s2 for 4.15 s, making straight skid marks 64.4 m long, all the way to the tree. With what speed (in m/s) does the car then strike the tree? i got 5.14 which is the the right answer but the second part im lost.. What If? If the car has the same initial velocity, and...
he driver of a car is initially moving at a constant speed of 72.0 km/h when...
he driver of a car is initially moving at a constant speed of 72.0 km/h when a traffic light turns red. If 0.500 s reaction time is required before the brakes can be applied, what is the distance in meters traveled by the car before it begins to slow down? Average speed 8 Com pute the average speed in m/s of a runner who completes a mile in 4.00 min.
The driver of a car is initially moving at a constant speed of 66.2 km/h when a traffic light turns red. If a 0.510 s reaction time is required before the brakes can be applied, what is the distance in meters traveled by the car before it begins to slow down?
11.78 A car is traveling at a constant speed of 54 km/h when its driver sees a child run into the road. The driver applies her brakes until the child returns to the sidewalk and then accelerates to resume her original speed of 54 km/h; the acceleration record of the car is shown in the figure. Assuming x = 0) when t = 0, determine (a) the time t, at which the velocity is again 54 km/h, (b) the position...
he driver of a car is initially moving at a constant speed of 72.0 km/h when a traffic light turns red. If 0.500 s reaction time is required before the brakes can be applied, what is the distance in meters traveled by the car before it begins to slow down? Average speed 8 Com pute the average speed in m/s of a runner who completes a mile in 4.00 min.
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