Question

A bullet of mass 10 g 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 joule overcoming the resistance of air will be

• A. 375
• B. 3750
• C. 5000
• D. 500

Answer 1

Answer: (B)

3750

Answer 2

Work done = change in kinetic energy of the body
$\, \, W=\frac{1}{2} \times \, 0.01[(1000)^2-(500)^2]=3750 \,joule.$