A body of mass 20 kg falls through a distance of 50 cm. Then the loss in potential energy is

Options

A. 98 J
B. 392 J
C. 980 J
D. 5000 J

Answer

A

Explanation

Here, mass of the body, m = 20 kg
Distance through which the body falls, h = 50 cm `= 50 xx 10^(-2) m `
Acceleration due to gravity, g ` = 9 . 8 m//s ^(2)`
The loss in potential energy is
`Delta U= mgh = (20 kg)( 9 . 8 m// s^(2)) ( 50 xx 10 ^(-2) m) = 98 J`