61. Which of the following quantity is a measure of inertia?
62. In oscillatory motion
63. The lever work based on
64. Action and reaction . . . . . . . .
65. Find the acceleration (in m/s2) of a body which accelerates from 10 m/s to 20 m/s in 4 seconds.
66. The three laws of motion were proposed by:
67. A jet engine works on the principle of
68. Positive acceleration means . . . . . . . .
69. Why does a fielder turn his arms backwards while catching a fast approaching cricket ball?
70. What is the other name of Newton's first law of motion?
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