Question 3 A 870.0 kg car moving with 13.5 m/s crushes with a wall resulting in

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Question 3

A 870.0 kg car moving with 13.5 m/s crushes with a wall resulting in a complete stop. The crush lasts for 0.5 s. Calculate the magnitude of the force exerted on the car by the wall. Give your answer as a whole number.

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Question 4

A force designed to have a triangular shape with a max of 4.5 N. The duration is 0.5 s (similar to figure 8.20 in the book, but with a triangular shape). This force is used to put a toy car of mass 0 kg in motion. Calculate the maximum speed of the toy car. Give your answer with one decimal points.

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Explanation / Answer

3) First calculate the acceleration using:

a = dv/dt = (13.5 – 0)/0.5 = 27 m/s2

Now, by Newton’s 2nd law of motion:

F = ma = 870*27 = 23,490 N

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