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A particle of mass 100 g is thrown verti...

A particle of mass `100 g` is thrown vertically upwards with a speed of `5 m//s`. The work done by the force of gravity during the time the particle goes up is

A

`-1.25` J

B

1.25J

C

0.5J

D

`-0.5` J

Text Solution

Verified by Experts

The correct Answer is:
A
`H_("max") = (u^(2))/(2g)= ((5)^(2))/(2 xx 10)= 1.25m`
Work done (W) `=vec(F). Vec(S)= FS cos theta`
`=mg xx H_("max") xx cos 180^(@)`
`= 0.1 xx 10 xx 1.25 xx (-1)= -1.25J`
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