Question

A particle of mass `0.2` kg is moving is one dimension under a force that delever is a constant preses `0.5 W` in the particle . If the detail speed `(n ms^(-1))` of the particle is zero , the speed`(mms^(-1))` after `5 xx` is

Answer 1

Here `Delta K.E. = W = P xx t `
`:. (1)/(2) mnu^(2) = P xx t `
`:. Nu = sqrt (2Pt)/(m) = sqrt(2 xx 0.5 xx 5 )/(0.2)) = 5 ms^(-1) `