1.

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

Answer»

Work DONE =f•s
m=100g
v=5m/s

force=mass×ACCELERATION
0.1×(-G)=-1N

since acceleration is CONSTANT so

{v}^{2} - {u}^{2} = 2as
-25=2(-g)s
s=1.25

now work done=-1N×1.25m

-1.25 joules is answer.


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