A tennis ball dropped on a horizontal smooth surface , it because back to its original position after hitting the surface the force on the bell during the collision is proportional 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. (a)
B. (b)
C. (c)
D. (d)

Answer

B

Explanation

During motion `K=1/2mv^2=1/2mg^2t^2`
`(d(KE))/(dt)=mv(dv)/(dt)=v(m(dB)/(dt))`