Is kinetic energy a scalar quantity or vector quantity ?

The kinetic energy $k$ of a particle moving along a circle of radius $R$ depends on the distance covered $s$ as $k = a{s^2}$ where $a$ is a constant. The force acting on the particle is

If the linear momentum is increased by $50\%$, the kinetic energy will increase by ............. $\%$

The kinetic energy of a body of mass $2 kg $ and momentum of $2 Ns$  is ............. $\mathrm{J}$

A spring of unstretched length $l$ has a mass $m$ with one end fixed to a rigid support .Assuming spring to be made of a uniform wire, the kinetic energy possessed by it if its free end is pulled with uniform velocity $v$ is

Two bodies are having kinetic energies in the ratio $16: 9$. If they have same linear momentum, the ratio of their masses respectively is