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

asked Apr 22, 2017 86.3k views

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Rate of change of momentum = impact force
(m*v-m*u)/t = F
4000*20/t = 80000 (note: v is zero as it stopped)
soo, t = 1 sec

Nick Price answered Apr 28, 2017

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