1.

For the same kinetic energy of a body ,what should b the changes in its velocity if its mass is increased four times?

Answer»

Solution :Let initial MASS `m_(1)` velocity =`v_(1)`
Final mass `m_(2)`=4M velocity =`v_(2)`
For the same kinetic energy ,
`(1)/(2)m_(1)v_(1)^(2)`
or `(1)/(2)MV^(2)=(1)/(2)xx4mxxv_(2)^(2)`
or `v_(2)^(2)=(1)/(4)v^(2)` or `v_(2)=(1)/(2)v `


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