# A car moving at 9 m/s crashes into a barrier and stops in 0.050 s. There is a 18-kg child in the car.

A car moving at 9 m/s crashes into a barrier and stops in 0.050 s. There is a 18-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?1Your answer is correct. N · s(b) What is the average force on the child?2Your answer is correct. N(c) What is the approximate mass of an object whose weight equals the force in part (b)?3 kg(d) Could you lift such a weight with your arm?

## Leave a Reply

Want to join the discussion?Feel free to contribute!