51. When a body falls from an aeroplane, there is increase in its
52. Which of the following never occurs singly in nature?
53. The moment of inertia of a body does not depend upon
54. Newton's first law of motion gives the concept of
55. For every action, there is an equal and opposite reaction, is Newton's
56. Gravitational force is maximum at which place
57. A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that
58. A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls
59. Rate of change of momentum is
60. Which law is also called law of inertia ?
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