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
- 0.5 J
d
- 1.25 J
answer is D.
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Detailed Solution
Maximum height =u22g=(5)22(10)=1.25mWgravity = -mgh = -1.25J