A 20 kg object moving with a velocity of 60 ms collides
(a) A 2.0 kg object moving with a velocity of +6.0 m/s collides with a 6.0 kg object that is initially at rest. After the collision, the 2.0 kg object moves with a velocity of -1.0 m/s.
(b) Find the energy lost in the collision.
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