There is T__ as much voltage. This
produces twice the current

Explanation:

Given

Ball is projected horizontally from a building of height

time taken to reach ground is given by

(b) Line joining the point of projection and the point where it hits the ground makes an angle of

From the figure, it can be written

Considering horizontal motion

(c) The vertical velocity with which it strikes the ground is given by

Thus, the ball strikes with a vertical velocity of