$A$ light and a heavy body have equal momenta. Which one has greater kinetic energy $(K.E.)$?

Two bodies of masses $m$ and $4m$ are moving with equal kinetic energy $(K.E.)$. The ratio of their linear momentums is

$A$ particle is dropped from a height $h$. $A$ constant horizontal velocity $u$ is given to the particle. Taking $g$ to be constant everywhere, the kinetic energy $E$ of the particle with respect to time $t$ is correctly shown in:

$A$ body of mass $8\,kg$ and another of mass $2\,kg$ are moving with equal kinetic energy. The ratio of their respective momenta will be.

Two particles of masses $m_{1}$ and $m_{2}$ have equal kinetic energies. The ratio of their momentum is

Give an important factor to control the speed of a vehicle in the area of a school or hospital.