Two bodies of different masses ${m_1}$ and ${m_2}$ have equal momenta. Their kinetic energies ${E_1}$ and ${E_2}$ are in the ratio
$\sqrt {{m_1}} :\sqrt {{m_2}} $
${m_1}:{m_2}$
${m_2}:{m_1}$
$m_1^2:m_2^2$
A ball of mass $2\;kg$ and another of mass $4\; kg$ are dropped together from a $60$ feet tall building. After a fall of $30$ feet each towards earth, their respective kinetic energies will be in the ratio of?
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 ............. $\mathrm{J}$
A body moving with velocity $v$ has momentum and kinetic energy numerically equal. What is the value of $v$ ........$m/s$
Two bodies of masses m and $2m$ have same momentum. Their respective kinetic energies ${E_1}$ and ${E_2}$ are in the ratio
The kinetic energy of a body decreases by $36\%$. The decrease in its momentum is ............... $\%$