A lorry and a car moving with the same $K.E.$ are brought to rest by applying the same retarding force, then
Lorry will come to rest in a shorter distance
Car will come to rest in a shorter distance
Both come to rest in a same distance
None of the above
$Assertion$ : If collision occurs between two elastic bodies their kinetic energy decreases during the time of collision.
$Reason$ : During collision intermolecular space decreases and hence elastic potential energy increases.
A ball strikes a horizontal surface as shown in figure. If co-efficient of restitution $e = 1/ \sqrt 3$, then angle $\theta$ is ............... $^o$
A sphere of mass $m $ moving with a constant velocity $u$ hits another stationary sphere of the same mass. If $e$ is the coefficient of restitution, then the ratio of the velocity of two spheres after collision will be
Statement $-1$: Two particles moving in the same direction do not lose all their energy in a completely inelastic collision.
Statement $-2$ : Principle of conservation of momentum holds true for all kinds of collisions.
Two small particles of equal masses start moving in opposite directions from a point $A$ in a horizontal circular orbit. Their tangential velocities are $v$ and $2 v$, respectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at $A$, these two particles will again reach the point $A$ ?