an 80 kg crash test dummy is traveling 35 m/s in a car. stops with a force of 4000N. what was the time it took for the dummy to stop

Answer 1

We can use Newton's law to find out the amount of deceleration:

F = ma

4000 = 80(a)

50 ^m/_s² = a

Now we can use one of the kinematic equations to find out how long it took the dummy to stop

v_f = v_i + at

0 = 35 + (-50) t

Now solve for t to find your answer