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A 4,000-kg car traveling at 20 m/s hits a wall with a force of 80,000 N and comes to a stop. What was the impact time?
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A 4,000-kg car traveling at 20 m/s hits a wall with a force of 80,000 N and comes to a stop. What was the impact time?

User Pheonix
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deceleration a=Δv/t -> t=Δv/a
Δv=20 m/s (from 20m/s to 0m/s)
from Newton's second law of motion: a=F/m
F=80000N
m=4000kg
a=80000/4000=20 m/s^2

t=20m/s / 20 m/s^2 = 1s
User Winter
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