Work, Power and EnergyHard

Question

A bullet of mass 10g leaves a riffle at an initial velocity of 1000m/sec and strikes the earth at the same level with a velocity of 500 m/sec. The work in overcoming the resistance of air will be :

Options

A.500J
B.5000J
C.3750J
D.475J

Solution

Loss of kinetic energy of bullet = The wok done in over coming air resistance.
(10002 - 5002)
(1500 × 500 = 3750 J)

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