Question

Instantaneous power of constant force acting on a particle moving in a straight line under the action of this force

• A. is constant
• B. increases linearly with time
• C. decreases linearly with time
• D. either increases or decreases linearly with time

Answer 1

The correct option is B increases linearly with time

Power is defined as rate of work done

$⟹$Power, $P=F.v$

Even though the force is constant, due to the force the velocity increases because of which its power increases.

Also from equations of motion we know that $v=u+at$

$⟹$ instantaneous power increases linearly with time