Question

A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m while applying the force and the ball goes upto 2 m height further, find the magnitude of the force. (Consider `g=10m//s^2`).
A. ` 22N`
B. `4 N`
C. `16 N`
D. `20 N`

Answer 1

Correct Answer - D
Work done by hand `=` max. P.E. of the ball
`Fxxs=mgh`
`F=(mgh)/(s)=(0.2xx10xx2)/(0.2)=20N`