A car moving at 10 ms crashes into a barrier and stops in, Ask an Expert

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Q. A car moving at 10 m/s crashes into a barrier and stops in 0.50s. There is a 20kg child in the car. Suppose that the child's velocity is changed by the same amount as the cars in the same time period.

1. What is the impulse needed to stop child?

2. What is average force on the child?

3. What is the approximate mass of an object whose weight equals the force in part b?

4. Could you lift such a weight with your arm?

5. Why is it advisable to use a proper restraining seat rather than hold a child on your lap?

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