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For how long should a force of `100 N` act on a body of mass `20kg` so that it aquires a velocity of `100m//s`?

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Here, `F=100N, m=20kg, u=0, v=100m//s`
`a=F/m=(100)/20= 5m//s^(2), t=?`
`v=u+at, 100=0+5t` or `t=(100)/5= 20s`

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