A car moving at 8 ms crashes into a barrier and stops in, Ask an Expert

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A car moving at 8 m/s crashes into a barrier and stops in 0.050 s. There is a 17-kg child in the car. Assume that the child's velocity is changed by the same amount as that of the car, and in the same time period.

(a) What is the impulse needed to stop the child?

N · s

(b) What is the average force on the child?

(d) Could you lift such a weight with your arm?

Yes

(e) Why is it advisable to use a proper restraining seat rather than hold a child on your lap?

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