Question

A train moves with a velocity of 30 ms^-1. A boy on the upper berth drops a ball of mass 100 g ,the K.E of the ball with respect to
I) a person on the ground and ii) for person sitting in the train at the time of dropping​
a) 45 J , 0J b) 0 J 45 J c) 22.5 J 22.5 J d) 45 J 45 J

Answer 1

Answer:

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Explanation:

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Answer 2

(i)with respect to a person on the ground

v=30ms−1

m=100g⇒110kg

K.E=12mv2=12×110×(30)2

K.E=45 J

(ii)with respect to a person sitting in a train at the time of dropping

v=0

K.E=12mv2

K.E=0J