A car moving at 125 ms crashes into a tree and stops in 038, Ask an Expert

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A car moving at 12.5 m/s crashes into a tree and stops in 0.38 s.

v=12.5m/s
t=0.28s
m=77kg

a) Calculate the magnitude of the force, in newtons, the seatbelt exerts on a passenger in the car to bring him to a halt. The mass of the passenger is 77kg.

b) What would the final velocity be, in m/s, if the car with the 77kg passenger had collided with (and stuck to) a car that has a mass equal to and is the opposite dierction at the same speed?

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