A stone is thrown vertically upwards and then it returns to the thrower. Is it a projectile motion? Explain
The motion is not projectile because a projectile should have two component of velocities in two mutually perpendicular directions. But, in this case the stone has velocity only in one direction, while going up or coming downwards.
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A bob of mass 0·1 kg, hung from the ceiling of a room by a string 2m long, is set into oscillation. The speed of the bob at its mean position is 1 m/s. What is the trajectory of the bob if the string is cut when the bob is: (a) at one of its extreme positions? (b) at its mean position?