A particle of mass m, initially at rest is acted upon by a variable force `F` For a brief interval of time `T`. It begins to move with a velcoity u after the force stops acting `F` is shown in the graph as a function of time Then
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A particle of mass m , initially at rest , is acted upon by a variable force F for a brief interval of time T . It begins to move with a velocity u after the forrce stops acting . F is shown in the graph as a function of time. The curve is a semicircle.

A particle of mass m at rest in acted upon by a force P for a time t. its kinetic energy after an interval t is

A block of mass m at rest is acted upon by a force F for a time t. The kinetic energy of block after time t is