Please help me in this question!! There is NO picture for this question! In a physics lab, 0.30 kg puck A, moving at 5.0 m/s [W], undergoes a collision with 0.40 kg puck B, which is initially at rest. Puck A moves off at 4.2 m/s [W 30° N]. Find the final velocity of puck B.

v2 = 0.6 m/s

Explanation:

Given:

Mass(m1) = 0.30 kg

Initial velocity(u1) = 5 m/s

Mass(m2) = 0.40 kg

Initial velocity(u2) = 0 m/s

Final velocity(v1) = 4.2 m/s

Find:

Final velocity(v2)

Computation:

Using conservation of momentum.

m1u1 +m2u2 = m1v1 + m2v2

(0.30)(5) + (0.40)(0) = (0.30)(4.2) + (0.40)(v2)

1.5 + 0 = 1.26 + 0.40 v2

0.24 = 0.40 v2

v2 = 0.6 m/s

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