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A mass of 20 kg moving with a speed of 1...

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

A

600

B

800

C

1000

D

1200

Text Solution

Verified by Experts

The correct Answer is:
B
`m_(1)v_(1)+m_(2)v_(2)=(m_(1)+m_(2))v_(sys)`.
`20xx10+5xx0=(20+5)v_(sys)impliesv_(sys)=8m//s`
K.E. of composite mass `=(1)/(2)(20+5)xx(8)^(2)=800J`
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