Question

A body of mass 40kg having velocity 4 m/s collides with another body of mass 60kg having velocity 2 m/s. If the collision is inelastic, then loss in kinetic energy will be

• A. 440 J
• B. 392 J
• C. 48 J
• D. 144 J

Answer 1

Answer: (C)

48 J

Answer 2

Loss in kinetic energy

$= \frac { 1 } { 2 } \frac { m _ { 1 } m _ { 2 } \left( u _ { 1 } - u _ { 2 } \right) ^ { 2 } } { m _ { 1 } + m _ { 2 } } = \frac { 1 } { 2 } \left( \frac { 40 \times 60 } { 40 + 60 } \right) ( 4 - 2 ) ^ { 2 }$ $= 48 \mathrm {~J}$