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Work, Energy and Power
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A bullet of mass 10g leaves a rifle at an initial velocity of 1000 m/s and strikes the earth at the same level with a velocity of 500 m/s. The work done in joules overcoming the resistance of air will be
375
3750
5000
500
Correct Option:
B
W = ∆E =
1
m(v
1
2
- v
2
2
)
2
=
1
10 × (1000
2
- 500
2
) = 3750 J
2
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