A stone is projected upwards with speed 10m/s from the top of a 200m high building and at the same time another stone is projected vertically upwards from the ground with the speed of 50m/s in the same line . The time after which they collide is A) 4s. B)5s. C)8s. D)6s.
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Answer:
b
Explanation:
change frames to avoid calculation
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A) 4s is the answer. .............……
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