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Q.

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 :

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a

0.5 J

b

- 0.5 J

c

- 1.25 J

d

1.25 J

answer is D.

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Detailed Solution

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Maximum height =u22g=(5)22(10)=1.25m
Wgravity = -mgh = -1.25J

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