A machine which is 75 % efficient uses 12 J of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through, that distance. The velocity of the ball at the end of its fall is

Question

A machine which is 75 % efficient uses 12 J of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through, that distance. The velocity of the ball at the end of its fall is, 24 m s - 1, 32 m s - 1, 18 m s - 1, 3 m s - 1

MARKS App · Accepted Answer

Useful work = 75 100 × 12 J = 9 J Now, 1 2 × 1 × v 2 = 9 or v = 18 m s - 1

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