A body of mass 3 kg starts from rest with a uniform acceleration of unknown magnitude. If the body has a velocity of 30 m/s in 6 seconds, what is the power consumed in 3 seconds?

225 W

Newton's Equation of Motion : \(v = u + at\)

30 = a x 6

a = 5 m/s²

Force (F) = m x a

    = 3 x 5 = 15 N

Also, \(v’ = u + at’\)

v’ = 5 x 3 = 15 m/s

Power consumed in 3 seconds = F x v’

    = 15 N X 15 m/s

    = 225 W.