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1. Two cars A and B are heading forward. The velocity of A and B are...

1. Two cars A and B are heading forward. The velocity of A and B are 30 m/s and 20 m/s respectively. If their masses are same as 9.0*10^5 g, (a) find out their initial momentum, (b) if they have an accident and then the velocity of the B is 28 m/s, find out velocity of A. (c) Final momentum of each car.

2. Jonathan was driving a car at a speed of 20.5 m/s and stopped car in 2.5 s using brakes. If the mass of car with him is 1.5x106 g, what is the average horizontal force exerted on it during braking? Assume the road is leveled.

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