Question

two identical balls moving in opposite direction with speed 20 metre per second and 25 metre per second undergoes head on perfectly inelastic collision the speed of combined mass after collision
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Answer 1

Answer:

The answer is 2.5 m/s

Explanation:

Law of conservation of momentum says," total initial momentum of the two masses= total final momentum of the combined masses.

Change in momentum =>  m1μ1 +mμ2 = m1v1 + m2v2

2Vfm = 20m - 25m

2Vfm = -5m

2Vf = -5

Vf = -5/2

Vf = - 2.5 m/s

| Vf | = 2.5 m/s

Thus the speed after collision is 2.5 m/s