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CBSE Class 11-science Answered

A mass of 30 kg moving with a speed of 20 m/s collides with another stationary mass of 10 kg. As a result of collision, the two mass stick together. What will be the kinetic energy of composite mass?
Asked by Topperlearning User | 15 Jul, 2014, 11:30: AM
answered-by-expert Expert Answer

Let v be the velocity of composite mass

Momentum after collision = (30+10) v
Momentum before collision = 30 × 20 + 10 × 0
Applying principle of conservation of momentum, we have
(30+10) v = 30 × 20 + 10 × 0
40 v = 600
or v = 15 m/s
Now, kinetic energy is given as
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Answered by | 15 Jul, 2014, 01:30: PM

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