Work Energy And Power Question 221

Question: Calculate the K.E and RE. of the ball half way up, when a ball of mass 0.1 kg is thrown vertically upwards with an initial speed of 20ms1 .

Options:

A) 10J,20J

B) 10J,10J

C) 15J,8J

D) 8J,16J

Show Answer

Answer:

Correct Answer: B

Solution:

[b] Total energy at the time of projection

=12mv2=12×0.1(20)2=20J

Half way up, P.E. becomes half the P.E. at the top i.e. P.E.=202=10J

K.E.=2010=10J



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