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