Question

5. A car starting from rest moves in a straight line with a constant acceleration of 2.20 m's for 100 s,then slows down to a stop with a constant deceleration of 3.05 m/s. How far does it travel? meters 6. Two cars are traveling along a straight road. Car (A) maintains a constant spoed of 900 kmh: car (B) maintains a constant spoed of 101 km/h. Att0, car (B) is 450 km behind car A. How far will car (A) travel from t O before it is overtaken by car (B) km ally downward from the edge of a bridge 30.0 m high with an initial speed of 100 m's The ball fls al the way down and 7. A ball is thrown strikes the water below. Determine the time it takes the ball to strike the water rern vwic 8. A photographer in a helicopter ascending vertically at a constant rate of 1.3 m/'s accidentally drops a camera out the window when the helicopter is 140 m above the ground. (a) How long will it take the camera to reach the ground? 9. (b) What will its speed be just before it hits the ground? m/s 10. An object initially at rest experiences an acceleration of 2.00 m/s for 5.10 s then travels at that constant velocity for another 9.50s. What is the m/s

Answer 1

Distance travelled in first 10 sec = ut + 1/2 at^2 = 0 times 10 + 1/2 times 2.2 times 10^2 = 0 + 110 = 110 metre speed after 10 sec, v = u + at v = 0 + 2.2 times 10 v = 22 m/s. Distance Travelled during deceleration, Apply 3rd equation of motion. v^2 = u^2 + 2 as 0 = (22)^2 + 2 (-3.05) s = -(22)^2/-2 times 3.05 = 79.344 Total distance travelled by car is 110 + 79.344 = 189.344 meters