An object of $m\, kg$ with speed of $v\, m/s$ strikes a wall at an angle $\theta$ and rebounds at the same speed and same angle. The magnitude of the change in momentum of the object will be

A block of mass $2\, kg$ is suspended $5\,m$ from a string, is released from a height of  $5\,m$ as shown in figure then what will be the impulse when string. Just becomes tight ............ $N-s$

In a carom-board game the striker and the coins are identical and of mass $m$ . In a particular hit the coin is hit when it is placed close to the edge of the board as shown in figure such that the coin travels  parallel to the edge. If the striker is moving with speed $v$ before the strike, then the net impulse on the striker during collision if it moves perpendicular to the edge after collision, is (assume all collisions to be perfectly elastic)

The mass of a hydrogen molecule is $3.32 \times 10^{-27 } $ $kg$. If $10^{23}$ hydrogen molecules strike, per second, a fixed wall of area $2$ $cm^2$ at an angle of $45^o $ to the normal, and rebound elastically with a speed of $10^3\ m/s$, then the pressure on the wall is nearly:

The magnitude of force acting on a particle moving along $x$-axis varies with time $(t)$ as shown in figure. If at $t=0$ the velocity of particle is $v_0$, then its velocity at $t=T_0$ will be

A bullet is fired from a gun. The force on the bullet is given by $F = 600 - 2 \times {10^5}t$, where $F$ is in newtons and $t$ in seconds. The force on the bullet becomes zero as soon as it leaves the barrel. What is the average impulse imparted to the bullet  ........... $N-s$