Q.

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

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a

600 Joule

b

800 Joule

c

1000 Joule

d

1200 Joule

answer is B.

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Detailed Solution

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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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