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

State law of conservation of momentum and prove it.

What is Newton's second law?

Why does a boxer move his head backwards when his opponent blows a punch?

Define Newton's second law.

Define linear momentum. Write its formula. Give its SI unit. Is it a scalar or a vector quantity?

What is head-on collision?

Why a cricketer lower his hands while catching a ball?

What is the direction of linear momentum?

While catching a fast moving ball, fielder gradually pulls his hand backwards. Give reason.