A spring is kept compressed by a small trolley of mass $0.5kg$ lying on a smooth horizontal surface as shown in the adjacent fig. When the trolley is released, it is found to move at a speed $v=2m{s}^{-1}$. What potential energy did the spring possess when compressed?

Q.

A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the figure given below:

When the trolley is released, it is found to move at a speed of 2 ms^-1. What potential energy did the spring possess when compressed?

Q. A spring is kept compressed by a toy car of mass $150g$. On releasing the car, it moves with a speed of $0.2m{s}^{-1}$. So, the elastic potential energy of the spring is

Q. A ball is placed on a compressed spring. When the spring is released, the ball is observed to fly. What form of energy does the compressed spring possess?

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Q. A spring is held compressed. its stored energy is 2.4 joule its end are in contact with mass of 1 gm and 48 gm placed on a smooth horizontal surface. when the spring is released ,the mass of 48 gm will acquire a velocity of-