51. A body of mass 2 kg is thrown upward with initial velocity of 20 m/s. After 2 seconds, its kinetic energy will be : (g = 10 m/s2)
52. The energy stored in a watch spring is
53. An object that has kinetic energy must be
54. A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the body is: [Given g = 9.8 m/s2]
55. A person lifts luggage of 20 kg from the ground and puts it on his head 2m above the ground. Calculate the work done by him. (g = 10 )
56. Work done in a free expansion process is
57. An object of 10 kg is moving with a speed of 2 m/s. The kinetic energy of the object is
58. If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by
59. Kinetic energy depends on
60. The device used to convert solar energy into electricity is
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