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 0.050 s. There is a 20 kg child in the car. Assume that the child's velocity is changed by the similar amount as the car's in the similar time period.

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

(b) What is the average force on child?

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

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

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