Question

A certain particle undergoes erratic motion. At every point in its motion, the direction of the particle's momentum is always

• A. the same as the direction of its velocity
• B. the same as the direction of its acceleration
• C. the same as the direction of its net force
• D. the same as the direction of its kinetic energy

Answer 1

The correct option is A the same as the direction of its velocity

Linear momentum ($\overrightarrow{P}$) of a body of mass m and velocity $\overrightarrow{v}$ is expressed as: $\overrightarrow{P}=m\overrightarrow{v}$.

Since, $\overrightarrow{P}$ is a vector quantity and its direction is defined by the direction of $\overrightarrow{v}$, it always has the same direction as $\overrightarrow{v}$.