1.

A body of mass 50 kg is at rest. The work doen to accelerate it by 20m/s in 10 s is

Answer»

`10^(3)J`
`10^(4)J`
`2xx10^(3)J`
`4xx10^(4)J`

SOLUTION :`a=(v-u)/t=2ms^(-2),5=ut+1/2at^(2)=100M`
`W=FxxS=10^(4)J`


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