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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.
Attempt either (I) with all sub parts or (II) with all sub parts from the following two questions-
Define power. How will you differentiate between kW and kW h? If the velocity of a ball is tripled, what will be the ratio of
Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it.
A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goal keeper to
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