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Collisions

Question

Two putty balls of equal mass moving with equal velocity in mutually perpendicular directions, stick together after collision. If the balls were initially moving with a velocity of 452ms1 each, the velocity of their combined mass after collision is

Moderate
Solution

Initial momentum 
P=m452i^+m452j^ |P|=m×90
Final momentum 2m×V
By conservation of momentum  2m×V=m×90
V=45m/s



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