Question

A car of mass M kg moves with a velocity of 2 $m{s}^{-1}$. If its velocity decreases to 1 $m{s}^{-1}$, then what will be its final momentum?

• A. 2M kg $m{s}^{-1}$
• B. 1M kg $m{s}^{-1}$
• C. 4M kg $m{s}^{-1}$

Answer 1

The correct option is B 1M kg $m{s}^{-1}$

• Momentum is the product of the mass and velocity of a body, i.e., p = m x v.
• Here, mass = M kg, and final velocity = 1 $m{s}^{-1}$
• Hence, the final momentum will be M x 1 kg $m{s}^{-1}$ = 1M kg $m{s}^{-1}$