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

v= gt, `K= (1)/(2) mg^(2) t^(2) rArr k prop t^(2)` parabolic path
During collision KE first decrease then increases.