Question

What average force is required to stop a 1700 kg car in 9.0 s if the car is traveling at 85 km/h ?

Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is in the direction opposite to the initial velocity.

Answer 1

Concept - find the acceleration using the equation of kinematics. Use Newton’s law of motion to find the force as shown below

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