A bomb of mass $30\,kg$at rest explodes into two pieces of masses $18\,kg$ and $12\,kg$. The velocity of $18\,kg$ mass is $6\,m{s^{ - 1}}$. The kinetic energy of the other mass is ....... $J$
$256 $
$486$
$524$
$324$
Two bodies of masses $2m$ and $m$ have their K.E. in the ratio $8 : 1$, then their ratio of momenta is
Two bodies of masses m and $2m$ have same momentum. Their respective kinetic energies ${E_1}$ and ${E_2}$ are in the ratio
If the kinetic energy of a body becomes four times of its initial value, then new momentum will
A bomb of $12 \,kg$ explodes into two pieces of masses $4 \,kg $ and $8 \,kg$. The velocity of $8\,kg$ mass is $6 m/sec$. The kinetic energy of the other mass is ............. $\mathrm{J}$
If a man increase his speed by $2 \,m/s$ , his K.E. is doubled, the original speed of the man is