$100 \,g$ of a iron ball having velocity $10 \,m/s$ collides with a wall at an angle ${30^o}$ and rebounds with the same angle. If the period of contact between the ball and wall is $0.1 \,second$, then the force experienced by the ball is ............. $\mathrm{N}$
$100$
$10$
$0.1$
$1$
A ball of mass m moves with speed $v$ and it strikes normally with a wall and reflected back normally, if its time of contact with wall is $t$ then find force exerted by ball on wall
A particle of mass $m$ is moving in a straight line with momentum $p$. Starting at time $t = 0$, a force $F = kt$ acts in the same direction on the moving particle during time interval $T$ so that its momentum changes from $p$ to $3p$. Here $k$ is a constant. The value of $T$ is
A body moves with velocity $v = ln x\ m/s$ where $x$ is its position. The net force acting on body is zero at
A particle of mass $m$ is moving with a uniform velocity $v_1$. It is given an impulse such that its velocity becomes $v_2$. The impulse is equal to
A machine gun fires a bullet of mass $40\, g$ with a velocity $1200\, ms^{-1}$. The man holding it, can exert maximum force of $144\, N$ on the gun. How many bullets can he fire per second at the most ?