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A 16-g mass is moving in +x direction at 30 cm/s while a 4-g mass is moving in the -x direction at 50 cm/s. they collide head-on and stick together. Find their velocity after collision?

1 answer

x momentum = 16*30 = 480 g cm/s
-x momentum = 4*50 = -200 g cm/s

total x momentum = +280 g cm/s

That will NOT CHANGE !

new mass = 16 + 4 = 20 g
so
20 * Vx = 280
Vx = 14 cm/s
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