When two bodies collide elastically, then
Kinetic energy of the system alone is conserved
Only momentum is conserved
Both energy and momentum are conserved
Neither energy nor momentum is conserved
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
A body of mass m having an initial velocity $v$, makes head on collision with a stationary body of mass $M$. After the collision, the body of mass $m$ comes to rest and only the body having mass $M$ moves. This will happen only when
An object of mass $M$ is at rest on smooth horizontal surface. Objects of different masses collide head on elastically to the object of mass $M$ . All colliding objects are having fixed same kinetic energy and in each case mass $M$ is supposed to be at rest initially. In this experiment the kinetic energy transferred to stationary mass $(M)$ depend on linear momentum of incoming colliding mass then energy transferred to $M$ in a collision is
Two balls $A$ and $B$ having masses $1\, kg$ and $2\, kg$, moving with speeds $21\, m/s$ and $4\, m/s$ respectively in opposite direction, collide head on. After collision Amoves with a speed of $1\,m/s$ in the same direction, then correct statements is :
Six identical balls are lined in a straight groove made on a horizontal frictionless surface as shown. Two similar balls each moving with a velocity $v$ collide elastically with the row of $6$ balls from left. What will happen