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JEE 2020 Revision Quiz: Work, Energy & Power

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Question 1

A particle of mass m makes a head-on elastic collision with a particle of mass 2 m initially at rest. The velocity of the first particle before and after collision is given to be

and

. Then which of the following statement is true in respect of this collision?

Question 2

A body moves a distance of 10 m along a straight line under the action of a force of 5 newtons. If the work done is 25 joules, the angle which the force makes with the direction of motion of the body is

Question 3

A 3.628 kg freight car moving along a horizontal rail road spur track at 7.2 km/hour strikes a bumper whose coil springs experiences a maximum compression of 30 cm in stopping the car. The elastic potential energy of the springs at the instant when they are compressed 15 cm is

Question 4

A particle of mass m is moving in a horizontal circle of radius r under a centripetal force equal to

where K is a constant. The total energy of the particle is–

Question 5

A piece of wood of mass 0.03 kg is dropped from the top of a 100 m height building. At the same time, a bullet of mass 0.02 kg is fired vertically upward, with a velocity 100 ms^-1, from the ground. The bullet gets embedded in the wood. Then the maximum height to which the combined system reaches above the top of the building before falling below is : (g =10ms^-2)

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Apr 13JEE & BITSAT