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4. Two cars are stationary at the beginning. If the car having 10 kg mass starts
to move to the east with a velocity of 5 m/s, find the velocity of the car having
mass 4 kg with respect to the ground.
5. There are two cars moving at a speed of 50 km/s and 70 km/s with a mass of
100 kg and 60 kg respectively. Find the final speed of both after the collision.

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