81. Which of the following examples illustrates Newton's first law of motion?
82. If we move the tree branch fast then some of the leaves get detached from the tree due to-
83. The correct relation of speed, distance and time is . . . . . . . .
84. Among which of the following is the maximum value of inertia?
85. Speed of body is
86. At any moment, the acceleration of a rocket is proportional to the nth power of the velocity of the released gases. The value of 'n' should be-
87. The velocity of a car increases uniformly from 18 kmhr-1 to 72 kmhr-1 in 10 s. Calculate the acceleration of the car.
88. An athelete runs for some time before the high jump so that the inertia of the . . . . . . . . helps him take the long jump.
89. Statement I When a gun is fired, i.e. it placing pushes back with much less velocity than the velocity of the bullet.
Statement II Velocity of the recoiling gun is less because the gun is much heavier than bullet.
According to the Principle of conservation of momentum when the gun is fired, momentum of gun and bullet system remains constant.
Statement II Velocity of the recoiling gun is less because the gun is much heavier than bullet.
According to the Principle of conservation of momentum when the gun is fired, momentum of gun and bullet system remains constant.
90. The distance-time graph for the motion of an object moving with a constant speed is a
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