# 1)a ball is thrown vertically upwards . Draw velocity time graph of this motion?2)define angle of friction?3)the speed of a projectile reduces to 50% on reaching maximum height. what is the horizontal range?4)distinguish b/w elastic & nonelastic collision .give 1 example for each

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Suppose a body is resting on a horizontal rough surface. A force F is applied to it such that a frictional force f nullifies the applied force and the body is in the verge of movement.

The angle made by the resultant of the normal force and the frictional force with the normal is called the angle of friction.

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