can anyone help me to solve with explain stions
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can anyone help me to solve with explain stions
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Answer:
12 m
Explanation:
We will have to use energy convservation since there was no external force:
Mechanical (initial) = Mechanical (final)
U1 + 0 = U2 + K
=> K = U1 - U2 = loss
=> K = mgH where H is the height which it falls.
Now object loses 40% potential energy.
So K =2U/5
⇒ K = 2U/5
⇒ K = 2× 900 =1800 J
1800 = 15×10×H
⇒ H = 180/15
⇒ H = 12m (ans)