What is the shape of the graph between the speed and kinetic energy of a body

An athlete in the olympic games covers a distance of $100\ m$ in $10\ s$. His kinetic energy can be estimated to be in the range

The machine as shown has $2$ rods of length $1\, m$ connected by a pivot at the top. The end of one rod is connected to the floor by a stationary pivot and the end of the other rod has a roller that rolls along the floor  in a slot As the roller goes back and forth, a $2\, kg$ weight moves up and down. If the roller is moving towards right at a constant speed, the weight moves up with a

The same retarding force is applied to stop a train. The train stops after $80 m$. If the speed is doubled, then the distance will be

A particle is moving in a horizontal circle with constant speed. It has constant

A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that