A mass $m_1$ moves with a great velocity. It strikes another mass $m _2$ at rest in a head on collision. It comes back along its path with low speed, after collision. Then
$m_1 > m_2$
$m_1 < m_2$
$m_1=m_2$
$m _1 \geq m _2$
A smooth sphere $A$ of mass $m$ collides elastically with an identical sphere $B$ at rest. The velocity of $A$ before collision is $8\ m/s$ in a direction making $60^o$ with the line of centres at the time of impact.
$(i)$ The sphere $A$ comes to rest after collision.
$(ii)$ The sphere $B$ will move with a speed of $8\ m/s$ after collision.
$(iii)$ The directions of motion $A$ and $B$ after collision are at right angles.
$(iv)$ The speed of $B$ after collision is $4\ m/s$ . The correct option is
Blocks of masses $m , 2 m , 4 m$ and $8 m$ are arranged in a line on a frictionless floor. Another block of mass $m ,$ moving with speed $v$ along the same line (see figure) ollides with mass $m$ in perfectly inelastic manner. All the subsequent collisions are also perfectly inelastic. By the time the last block of mass $8 m$ starts moving the total energy loss is $p \%$ of the original energy. Value of $'p'$ is close to
The bob $A$ of simple pendulum is released when the string makes an angle of $45^o$ with the vertical. It hits another bob $B$ of the same material and same mass kept at rest on the table. If the collision is elastic, then
A body of mass $5\,kg$ strikes another body of mass $2.5\,kg$ initially at rest. The bodies after collision coalesce and begin to move as a whole with a kinetic energy of $5\,J$. The kinetic energy of the first body before collision is ............... $\mathrm{J}$
A ball of mass $m$ moving with speed $u$ collides with a smooth horizontal surface at angle $\theta$ with it as shown in figure. The magnitude of impulse imparted to surface by ball is [Coefficient of restitution of collision is $e$]