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A 16 gm mass is moving in the +x direction at 30 cm/s while a 4 gm is moving in the -x direction at 50 cm/s. They collide head - on and stick together. Their common velocity after impact is

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a

0.14cm/s

b

0.14m/s

c

0ms-1

d

0.3m/s

answer is B.

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A 16 gm mass is moving in the +x direction at 30 cm/s while a 4 gm is moving in the -x direction at 50 cm/s. They collide head - on and stick together. Their common velocity after impact is