First slide

Work

Question

A ball is released from the top of a tower. The ratio of work done by force of gravity in first, second and third second of the motion of the ball is

Moderate

A

1 : 2 : 3
B

1 : 4 : 9
C

1 : 3 : 5
D

1 : 5 : 3

Solution

When the ball is released from the top of tower then ratio of distances covered by the ball in first, second and third second
$h_{I} : h_{II} : h_{III} = 1 : 3 : 5 :$ [because $h_{n} \propto (2 n - 1)]$
$∴$ Ratio of work done ${mgh}_{I} : {mgh}_{II} : {mgh}_{III}$ = 1:3:5

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