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

$A$ particle of mass $m_1$ moves with velocity $v_1$ and another particle of mass $m_2$ moves with velocity $v_2$. Both have the same momentum,but their kinetic energies are $E_1$ and $E_2$ respectively. If $m_1 > m_2$,then:

If $E - V < 0$,is this condition possible?

If momentum is increased by $20\%$,then kinetic energy ($K$.$E$.) increases by ........... $\%$

$A$ running man has half the kinetic energy of a boy who has half the man's mass. The man speeds up by $1 \, m/s$ so that his kinetic energy becomes equal to that of the boy. The original speed of the man is:

The kinetic energy of a particle increases by $300\%$. The percentage increase in its momentum is ........ $\%$.