Three particles each of mass $m$ are located at the vertices of an equilateral triangle $ABC$. They start moving with equal speeds $v$ each along the medians of the triangle and collide at its centroid $G$. If after collision, $A$ comes to rest and $B$ retraces its path along $GB,$ then $C$
also comes to rest
moves with a speed $v$ along $CG$
moves with a speed $v$ along $BG$
moves with a speed along $AG$
A mass $'m'$ moves with a velocity $'v'$ and collides inelastically with another identical mass in rest. After collision the $I^{st}$ mass moves with velocity $\frac{v}{{\sqrt 3 }}$ in a direction perpendicular to the initial direction of motion. Find the speed of the $2^{nd}$ mass after collision
A neutron makes a head-on elastic collision with a stationary deuteron. The fractional energy loss of the neutron in the collision is
The force constant of a wire is $k$ and that of another wire is $2k$. When both the wires are stretched through same distance, then the work done
Three objects $A$, $B$ and $C$ are kept in a straight line on a frictionless horizontal surface. These have masses $m, 2 m$ and $m$, respectively. The object $A$ moves towards $B$ with a speed $9 \mathrm{~m} / \mathrm{s}$ and makes an elastic collision with it. Thereafter, $B$ makes completely inelastic collision with $C$. All motions occur on the same straight line. Find the final speed (in $\mathrm{m} / \mathrm{s}$ ) of the object $\mathrm{C}$.
A block of mass $m$ is moving with a velocity $u$ on a smooth horizontal surface towards a wedge of same mass initially kept at rest. Wedge is free to move in any direction. Initially the block moves up the smooth incline plane of the wedge to a height $h$ and again moves down back to the horizontal plane. In this process the wedge gains a velocity equal to