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

$A$ particle is initially at rest on a frictionless horizontal surface. $A$ force of constant magnitude and direction is applied to it. The graph shows the work done $(W)$ on the particle versus its speed $(v)$. If no other horizontal forces act on the particle,what should the graph look like?

In the non-relativistic regime,if the momentum is increased by $100\%$,the percentage increase in kinetic energy is (in $\%$)

Two bodies $A$ and $B$ having masses in the ratio of $3 : 1$ possess the same kinetic energy. The ratio of their linear momenta is then

The kinetic energy of a body is increased by $4$ times. Its momentum will

$A$ $4 \,kg$ mass and a $1 \,kg$ mass are moving with equal kinetic energies. The ratio of the magnitude of their linear momenta is