A wooden block of mass $M$ is suspended by a cord and is at rest. A bullet of mass $m,$ moving with a velocity $v$ passes through the block and comes out with a velocity $v/2$ in the same direction. If there is no loss in kinetic energy, then upto what height the block will rise
${m^2}{v^2}/2{M^2}g$
${m^2}{v^2}/8{M^2}g$
${m^2}{v^2}/4Mg$
${m^2}{v^2}/2Mg$
A light and a heavy body have equal momenta. Which one has greater K.E
The energy required to break one bond in $DNA$ is $10^{-20}\, J.$ This value in $eV$ is nearly
Define kinetic energy. Give its unit and dimensional formula and mention works by using it.
Two masses of $1 \,gm$ and $4 \,gm$ are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is
The mass of two substances are $4gm$ and $9gm$ respectively. If their kinetic energies are same, then the ratio of their momenta will be