Conservation of Momentum

A boy of mass $50 \mathrm{k}\mathrm{g}$ jumps out of a rowing boat of $300 \mathrm{k}\mathrm{g}$ on to the bank with a horizontal velocity of $3 \mathrm{m} {\mathrm{s}}^{-1}$. With what velocity does the boat begin to move backwards?

A bullet of mass $10 \mathrm{g}$ travelling at $200 \mathrm{m} {\mathrm{s}}^{-1}$strikes and remains embedded in a $2 \mathrm{k}\mathrm{g}$ freely suspended wooden block. What is the velocity acquired by the block?

A gun of mass $\mathrm{M} \mathrm{kg}$ fires a shell of mass $1.5 \mathrm{kg}$ with a velocity of $150 \mathrm{m} {\mathrm{s}}^{-1}$ and recoils with a velocity of $1.5 \mathrm{m} {\mathrm{s}}^{-1}$. Calculate the mass of the gun.

A gun of mass $1000 \mathrm{kg}$ fires a shell of mass $2 \mathrm{kg}$ with a velocity of $200 \mathrm{m}/\mathrm{s}$. Calculate the velocity of recoil of the gun.

Sum of moments of components of a system remains _____.

State the law of conservation of momentum.

A girl of mass $40 \mathrm{kg}$ jumps with a horizontal velocity of $5 \mathrm{m} {\mathrm{s}}^{-1}$ onto a stationary cart with frictionless wheels. The mass of the cart is $3 \mathrm{kg}$. What is her velocity as the cart starts moving?

A revolver of mass $500 \mathrm{g}$ fires a bullet of mass $10 \mathrm{g}$ with a speed of $100 \mathrm{m} {\mathrm{s}}^{-1}$. Find the momentum of bullet, initial momentum of bullet and revolver and the recoil velocity of revolver.

What does law of conservation of momentum state?

A body of mass $50 \mathrm{kg}$ has a momentum of $250 {\mathrm{kgms}}^{-1}$, its velocity is _____${\mathrm{ms}}^{-1}$.

A toy car of mass $250 \mathrm{g}$ is moving with a velocity of $5 {\mathrm{ms}}^{-1}$, its momentum is _____ ${\mathrm{kgms}}^{-1}$.

What is the momentum of an object of mass m, moving with a velocity v?

Rocket works on the principle of conservation of

A goalkeeper in the game of football pulls his hands backward after holding the ball shot at the goal. This enables the goalkeeper to

The momentum of an object is given by the formula : $momentum=mass\times x$. Here $x$ is _____.

A metal ball rebounds better than rubber ball. True or false?

A force can do no work on a body, yet the body can move under accelerated motion. True or false?

One of the sources of renewable energy is _____. 

The source of geothermal energy is _____ .

A nonrenewable energy is _____.