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
1,.25 J
b
0 .5 J
c
-0.5J
d
-1.25J
answer is D.
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Detailed Solution
Maximum height attained by the particleh=u22g=(5)22×10=54mW=−mgh=−0⋅1×10×(5/4)=−1⋅25J