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

$A$ boy is rolling a $0.5\, kg$ ball on a frictionless floor with a speed of $20\, ms^{-1}$. The ball gets deflected by an obstacle on the way. After deflection,it moves with $5\%$ of its initial kinetic energy. What is the speed of the ball now? (in $ms^{-1}$)

Two masses of $1 \,g$ and $4 \,g$ are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is

The $KE$ of a body is increased by $44 \%$. What is the percentage increase in its momentum?

When the speed of a vehicle increases by $2 \ m/s$,its kinetic energy doubles. What is the original speed of the vehicle?

The kinetic energy of a body of mass $3 \,kg$ and momentum $2 \,N-s$ is