A bead of mass 400   g is moving along a straight line under a force that delivers a constant power 1 .…

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
  1. 5
  2. 4
  3. 6
  4. 3

Solution

Work done =Pt

=1.2×6=7.2 J

From work-energy theorem we can write,

∆KE=work done

12×0.4×v2-0=7.2

⇒v2=36⇒v=6 m s-1

Asked in: AP EAMCET 2022 (04 Jul Shift 1)

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