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A projectile of mass m launched vertically upward

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Answer #1

a) conserving momentum

0 = 0.25m( 3vi +0.5vj) -0.25m(v) i +(0.5m)V3

V3 = -vi -vj

b)

third piece reaches ground first as its initial velocity is in downward direction

c)

center of mass always remains in tha same position

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