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A body projected with a speed u at an an...

A body projected with a speed `u` at an angle of `60^(@)` with the horizontal explodes in two equal pieces at a point where its velocity makes an angle of `30^(@)` with the horizontal for `1^(st)` time. One piece start moving vertically upward with a speed of `(u)/(2sqrt(3))` after explosion. what is velocity of one piece with respect to other in the vertical direction just after the explosion ?

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