A fast moving bullet when hits the window pane makes a round hole while a stone strikes and shatters it, why ?

A spark is produced when two stones strike against each other. Why?

Explain why a bullet fired against a glass windowpane makes a hole in it but the glass pane is not cracked .

The Indian coast guard, while patrolling, saw a suspicious boat with people. They were nowhere looking like fishermen. The coast guard were closely observing the movement of the boat for an opportunity to seize the boat. They observed that the boat is moving along a planar surface. At an instant of time, the coordinates of the position of the coast guard helicopter and the boat is (1, 3, 5) and (2, 5, 3) respectively. Based on the above answer the following: If the coast guard decides to shoot the boat at that given instant of time, when the speed of bullet is 36m/sec, then what is the time taken for the bullet to travel and hit the boat?

A boy is standing on a cart moving along x -axis with the speed of 10 m//s . When the cart reaches the origin he throws a stone in the horizontal x-y plane, with the speed of 5 m//s with respect to himself at an angle theta with the x -axis. It is found that the stone hits a ball lying at rest at a point whose co-ordinates are (sqrt(3)m, 1m) . The value of theta=40^(@)xxC is (gravitational effect is to be ignored). Find the value of C .

A stone when thrown on a glass window smashes the window pane to pieces , but a bullet from the gun passes through making a clean hole. Why ?