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A mass of 20 kg moving with a speed of 10m/s collides with another stationary mass of  5 kg. As a result of the collision, the two masses stick together. The kinetic energy of the composite mass will be

600 Joule
800 Joule
1000 Joule
1200 Joule

detailed solution

Correct option is B

m1v1+m2v2=(m1+m2)vsys. 20×10+5×0=(20+5) vsys.⇒vsys.=8 m​/​sK.E. of composite mass=12(20+5)×(8)2=800 J

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