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

A raindrop falling from a height $$h$$ above ground, attains a near terminal velocity when it has fallen through a height $$(3 / 4) h$$. Which of the diagrams shown in figure correctly shows the change in kinetic and potential energy of the drop during its fall up to the ground?

In a shotput event an athlete throws the shotput of mass 10 kg with an initial speed of $$1 \mathrm{~m} \mathrm{~s}^{-1}$$ at $$45^{\circ}$$ from a height 1.5 m above ground. Assuming air resistance to be negligible and acceleration due to gravity to be $$10 \mathrm{~m} \mathrm{~s}^{-2}$$, the kinetic energy of the shotput when it just reaches the ground will be

Which of the diagrams in figure correctly shows the change in kinetic energy of an iron sphere falling freely in a lake having sufficient depth to impart it a terminal velocity?