A body of mass 0.5 kg travels in a straight line with velocity $$v=a x^{3 / 2}$$ where $$a=5 \mathrm{~m}^{-1 / 2} \mathrm{~s}^{-1}$$. The work done by the net force during its displacement from $$x=0$$ to $$x=2 \mathrm{~m}$$ is

A body is moving unidirectionally under the influence of a source of constant power supplying energy. Which of the diagrams shown in figure correctly shown the displacement-time curve for its motion?

Which of the diagrams shown in figure most closely shows the variation in kinetic energy of the earth as it moves once around the sun in its elliptical orbit?

Which of the diagrams shown in figure represents variation of total mechanical energy of a pendulum oscillating in air as function of time?

A mass of 5 kg is moving along a circular path of radius 1 m. If the mass moves with $$300 \mathrm{~rev} / \mathrm{min}$$, its kinetic energy would be