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Before a rubber ball bounces off from the floor, the ball is in contact with the floor for a fraction of second. Which of the following statements is correct?

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Important Questions on Work, Energy and Power

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A particle describe a horizontal circle of radius 0.5 m with uniform speed. The centripetal force acting is 10 N. The work done in describing a semicircle is
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A boy pushes a toy box 2.0 m along the floor by means of a force of 10 N directed downward at an angle of 60° to the horizontal. The work done by the boy is
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A motor of 100 H.P. moves a load with a uniform speed of 72 km hr-1. The forward thrust applied by the engine on the car is
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A body accelerates uniformly from rest to a velocity of 1 m s-1 in 15 seconds. The kinetic energy of the body will be 29 J  when 't' is equal to [Take mass of body as 1 kg
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Two bodies A and B having masses in the ratio of 3: 1 possess the same kinetic energy. The ratio of linear momentum of B to A is
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A block of mass 0.50 kg is moving with a speed of 2.00 m s-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is:
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A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?
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Two balls of equal masses are thrown upwards along the same vertical direction at an interval of 2 s, with the same initial velocity of 39.2 m s-1. The two balls will collide at a height of