Question

answer quick guys
pls​

Answer 1

the answer is 3m , As the 25 percent mean 1/4 parr of 100 and if we divide 12 by 1/4 so the we get is 3 so answer is 3 m

Answer 2

The height from which the ball falls gives it a potential energy which converts to kinetic energy as the ball falls down. When the ball finally hits the ground, all the potential energy has converted to kinetic energy. If we assume mass of ball as M kg, then

Mgh = (final kinetic energy)

120M = (final K.E.)

Ball loses 25% of (final K.E.), so initial energy with which it bounces back = 75% of (final K.E) = (3/4) × 120M = 90M.

So to find the height to which the ball will bounce back we equate the initial energy (that is 90M) with the final energy (that is potential energy at the maximum height to which the ball has bounced).

90M = MgH

H= 9 metres.

So that's your answer.