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.
Define kinetic energy and provide its formula.
A cyclist travels along a straight path with a constant acceleration of 2 m/s². If the cyclist's initial velocity is 5 m/s, what is the cyclist's velocity after 4 seconds? Also, calculate the total distance covered in this time.
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.
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