First slide

Power

Question

A man carries a load of 50 kg to a height of 40 m in 25s. If the power of the man is 1568W, the mass of the man is,

Moderate

A

20 kg
B

50 kg
C

100 kg
D

75 kg

Solution

$\large P = \frac{{\left( {M + m} \right)gh}}{t} \Rightarrow 1568 = \frac{{\left( {M + 50} \right) \times 9.8 \times 40}}{{25}}$
M = 50 Kg

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