a. A truck of mass 2000 kg is moving with a velocity of 20 m/s,. if on applying brakes, the ruck stops after coming to a distance of 40 m, find the retarding force?
b. A car of mass 1000 kg moving with a velocity of 90 km/h collides with a tree and comes to stop in 10 s. what is the change in momentum of the car ? whats is the force applied the tree to stop the car?
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