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Question

A projectile is moving at 60 m/s at its highest point, where it breaks into two equal parts due to an internal explosion. One part moves vertically up at 50 m/s with respect to ground, the part will move at speed of :

A
110m/s
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B
120m/s
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C
130m/s
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D
1061m/s
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Solution

The correct option is C 1061m/s
Momentum conservation in y direction
p,p1 and p2 are momentum before collision and after collision
p=0 p1y=50
momentum conservation in x direction
p=60 p1y=0
sop2y=60
p2=502+602
p2=1061

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