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3.	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 ?
	A.	1.25J
	B.	0.5J
	C.	-0.5J
	D.	-1.25J

	Answer: Option D


	Explanation:
	Work done by the force of gravity = Loss in kinetic energy of the body Work done by the force of gravity = 1/2 m(v²-u²) = 1/2×100/1000×(0²-5²)J Work done by the force of gravity = -1.25J.



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Published by:Michael Daani

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