A machine which is 75 percent efficient, uses 12 joules 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 at the end of its fall is (in 
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
Potential energy of a body = 75% of 12 J
mgh = 9 J ⇒ ⇒ 
Now when this mass allow to fall then it acquire velocity
m/s.
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