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Question

50 kilo joule of energy causes or displacement of 25 metre in a body in the direction of force in 2.5 seconds. find the power in a unit of horsepower

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Solution

Power = work done / time
work done is equal to energy
work done = 50 kJ = 50000 J
time = 2.5 s
power = 50000 J / 2.5 s
power = 20000 J/s
power = 20000 watt
1HP( horse power) = 746 watt
power in watt = 20000 /746 HP
power = 26.809 HP
so power is of 26.8 horsepower.

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