The kinetic energy of a body of mass $4 \ kg$ moving with a velocity of $(2 \hat{i}-4 \hat{j}-\hat{k}) \ ms^{-1}$ is (in $J$)

$A$ ball is thrown vertically upwards with a velocity $v$ and an initial kinetic energy $E$. When it reaches half way to the top of its flight,what are its velocity and kinetic energy respectively?

The kinetic energy of a car is doubled when its velocity is increased by $1 \,m/s$. Then the initial velocity of the car is

If the momentum of a body is increased $n$ times,its kinetic energy increases by a factor of:

$A$ man increases his speed by $2 \ m/s$, and as a result, his kinetic energy doubles. What was his initial speed?

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