A tennis ball dropped on a barizoontal smooth surface , it because back to its original postion after hiting the surface the force on the bell during the collision is propertional to the length of compression of the bell . Which one of the following skethes desches discribe the variation of its kinetic energy `K` with time `1` mass apporiandly ? The figure as only illistrative and not to the scale .

Options

A.
B.
C.
D.

Answer

b

Explanation

Kinetic energy can be written as follows :
`K = (1)/(2) mu^(2) = (1)/(2)mg^(2) t^(2)`
At the time of collision kinetic energy of the ball first decreses andn then increases. Hence option (b) is correct.