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Find the work done by the force of gra...

Find the work done by the force of
gravity during the upward
journey when a particle of mass
100 g is thrown vertically upwards
with a speed of 5 `ms^(-1)`

A

`-0.5 J`

B

`-1.25 J`

C

1.25 J

D

0.5 J

Text Solution

Verified by Experts

The correct Answer is:
B
The height (h) traversed by
particle while going up is
`h=(u^(2))/(2g)=(25)/(2 xx 9.8)`

work done by gravity force=mg . H
`=0.1 xx g xx(25)/(2 xx 9.8)cos 180^(@)`
[ angle between force and
displacement is `180^(@)`]
`therefore" "W=-0.1 xx (25)/(2)=-1.25 J`
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