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physics
11
The driver of a 1000 kg car is speeding. He loses control and collides with a wall, coming to a stop. The crumple zone of the car absorbed 90 kN of force in 0.5 seconds. What was the car's speed at the time of impact?
Reply 1
Impulse (=force x time) = change in momentum
Reply 2
Just to add onto this: change in momentum is mv-mu
Reply 3
5
45 m/s
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