Define momentum. State its S.I. unit. An object of mass 50 kg. is accelerated uniformly from a velocity of 4ms⁻¹ to 8ms⁻¹ in 8s. Calculate the initial and final momentum of the object. Also find the magnitude of the force exerted on the object.
State the law of conservation of momentum. Why is a person hit harder when he falls on a hard floor than when he falls on sand from the same height? A bullet of mass 20g is fired horizontally with a velocity 100ms⁻¹ from a pistol of mass 1.5 kg. Calculate the recoil velocity of the pistol.
A force of 10 N is applied to a mass of 2 kg at rest. What will be its velocity after 5 seconds?
With the help of Second Law of Motion and the Universal Law of Gravitation derive an expression for acceleration due to gravity 'g'.
The weight of any person on the moon is about 1/6 times that on the earth. He can lift a mass of 15 kg on the earth. What will be the maximum, mass, which can be lifted by the same force applied by the person on the moon?
Identical packets are dropped from two aeroplanes, one above the equator and the other above the north pole, both at height 'h'. Assuming all conditions are identical, will these packets take same time to reach the surface of the earth? Justify your answer.
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