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X and Y are two identical masses at rest, suspended by an inextensible string passing over a smooth frictionless pulley. Particle X is given a push downwardswith a speed u. It collides with the floor and rebounds. a- both masses move before collision b- X and Y move with the same speed u in opposite directions before colision c- X and Y move upward with same speed d- X and Y move upwards with different speedsafter collision
a) is obviously correct b)is also correct c)is wrong d)is correct
a) is obviously correct
b)is also correct
c)is wrong
d)is correct
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