A bead of mass 400 g is moving along a straight line under a force that delivers a constant power 1 . 2 W to the bead. If the bead is initially at rest, the speed it attains after 6 sec in m s - 1

Question

A bead of mass 400 g is moving along a straight line under a force that delivers a constant power 1 . 2 W to the bead. If the bead is initially at rest, the speed it attains after 6 sec in m s - 1, 5, 4, 6, 3

MARKS App · Accepted Answer

Work done = P t = 1 . 2 × 6 = 7 . 2 J From work-energy theorem we can write, ∆ K E = work done 1 2 × 0 . 4 × v 2 - 0 = 7 . 2 ⇒ v 2 = 36 ⇒ v = 6 m s - 1

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