A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how high can the ball bounce back?

Given height ( h) = 10m

Let the mass be m

Now, the total energy of the ball is given by

= mgh

= m x 10 x 10

= 100m kgm²s^-2

Energy with which it moves up the ground after striking will be equal to of the total energy.

E = 60/100 x 100m kgm²s^-2

Height to which the ball will bounce back

h = E/m x g = 6 meter

Thus, option (A) is correct.

Hence, option (A) is correct.