A particle of mass \( 100 \mathrm{~g} \) is thrown vertically upwards with a speed of \( 5 \math...

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A particle of mass \( 100 \mathrm{~g} \) is thrown vertically upwards with a speed of \( 5 \mathrm{~m} / \mathrm{s} \). The work done by the force of gravity during the time the particle goes up is
[AIEEE 2006]
(a) \( -1.25 \mathrm{~J} \)
(b) \( 1.25 \mathrm{~J} \)
(c) \( 0.5 \mathrm{~J} \)
(d) \( -0.5 \mathrm{~J} \)
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