A gun fires a bullet of mass $50 \,gm$ with a velocity of $30\,m\,{\sec ^{ – 1}}$. Because of this the gun is pushed back with a velocity of $1\,m\,{\sec ^{ – 1}}$. The mass of the gun is ………. $kg$

An object of mass $3\,m$ splits into three equal fragments. Two fragments have velocities $v\hat j$ and $v\hat i$. The velocity of the third fragment is

In an explosion a body breaks up into two pieces of unequal masses. In this

Why law of conservation of linear momentum is universal and fundamental law ?

A body of mass $1000 \mathrm{~kg}$ is moving horizontally with a velocity $6 \mathrm{~m} / \mathrm{s}$. If $200 \mathrm{~kg}$ extra mass is added, the final velocity (in $\mathrm{m} / \mathrm{s}$ ) is: