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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 Joule

B

800 Joule

C

1000 Joule

D

1200 Joule

Text Solution

Verified by Experts

The correct Answer is:
B
`m_(1)v_(1) +m_(2)v_(2)= (m_(1) m_(2)) v_(sys)`
`20 xx 10 + 5 xx 0= (20+5)v_(sys) rArr v_(sys)= 8m//s`
K.E of composite mass `=(1)/(2) (20 + 5) xx (8)^(2)= 800J`
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