A 3.0-kg meatball is moving with a speed of 6.0 m/s directly toward a 2.0 kg meatball which is at rest. The two meatballs collide and stick together. What is their velocity immediately after the (inelastic) collision?
18 m/s
3.6 m/s
6 m/s
5 m/s
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Explanation:
Momentum before and after a collision is the same.
before collision:
P=mv
=3kg × 6 m/s
=18 kgm/s
the other meatball is at rest and has no momentum
after collision
P = mv
18 = (3+2)v
5v = 18
v = 3.6 m/s
(3+2)kg because they attach and so the new momentums mass value must be their masses combined
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