A car moving at 8 m/s crashes into a barrier and stops in 0.050 s. There is a 19 kg child in the car. Assume that the child's velocity is changed by the same amount as the car's 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?

N

(c) What is the approximate mass of an object whose weight equals the force in part (b)?

kg

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

Yes

No

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

### Recently Asked Questions

- How would this question be solved using R? Standards for automated filling of bulk coffee bean bags require that the mean fill amount should be 10 kg and the

- If Medication A is given 1 pill every 4 hours. If the first dose today is given at 8 AM, when is the last dose given?

- This medication (from question number 3) Medication A comes in enteric-coated pills of 4 milligram in each. How mang pills can the patient receiver per day?