A piece of wood of mass is dropped from the top of a height building

PHYSICS · Single correct · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

A piece of wood of mass 0.03 kg0.03 \text{ kg} is dropped from the top of a 100 m100 \text{ m} height building. At the same time, a bullet of mass 0.02 kg0.02 \text{ kg} is fired vertically upward, with a velocity 100 ms−1100 \text{ ms}^{-1}, from the ground. The bullet gets embedded in the wood. Then the maximum height to which the combined system reaches above the top of the building before falling below is: ( g=10 ms−2g = 10 \text{ ms}^{-2} ) (1) 20 m20 \text{ m} (2) 30 m30 \text{ m} (3) 40 m40 \text{ m} (4) 10 m10 \text{ m}

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