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pls send the solution for the question

pls send the solution for the question
 

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Grade:12

2 Answers

Abhishek Kumar
askIITians Faculty 255 Points
8 years ago
Energy utilizable = 21 x 0.28
Then,
mgh = 21 x 0.28
Solve for h
Saurabh Kumar
askIITians Faculty 2400 Points
8 years ago
Efficiency = Work done/Energy input

n = m g h/ Energy input
Put the value and get the answer

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