# physics

a black ball of mass 2kg moving at velocity 10m/s collide with a stationary white ball of mass 3kg.find their common velocity if they stick together after collision?

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1. the black ball's initial momentum is now shared by both balls

find the initial momentum (it is conserved)

use the combined mass to find the new velocity

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2. Given:
M1 = 2 kg, V1 = 10 m/s.
M2 = 3 kg, V2 = 0.
V3 = Velocity of M1 and M2 after collision.

p before = p after.
M1*V1 + M2*V2 = M1*V3 + M2*V3.
2 * 10 + 3 * 0 = 2*V3 + 3*V3,
V3 = m/s.

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