If the velocity of an object of mass $300 \ g$ is $(3\hat{i} + 4\hat{j}) \ m/s$,then its kinetic energy is . . . . . . $J$.

The momentum of an object increases by $50\%$. By what percentage will its $K.E.$ increase?

If a lighter body of mass $M_1$ and velocity $V_1$ and a heavy body of mass $M_2$ and velocity $V_2$ have the same kinetic energy,then:

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

$A$ body is falling under gravity from rest. When it loses a gravitational potential energy by $U,$ its speed increases to $v.$ The mass of the body shall be

Two particles have masses in the ratio $1 : 2$. If they have the same kinetic energy, what is the ratio of their momenta?