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 the particle goes up is
−0.5J
−1.25J
1.25J
0.5J
A
−1.25J
B
0.5J
C
−0.5J
D
1.25J
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Solution
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Work done by gravity will be negative times gain in potential energy.
So, potential energy is given by mgh.
Using formula: v2=u2+2as
⇒0=25+20s
⇒s=1.25
So work done by the gravity will be −mgh
=0.1×10×1.25
=1.25J
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