Question

A ball of mass m is thrown up to height h in air with an initial velocity v,as shown.
Air resisitance is considered negligible. The acceleration of free fall is $g$.
what is the total work done by the gravitational force on the ball during its flight from $P$ to $Q$?

• A. $Zero$
• B. $\frac{1}{2}m{v}^2$
• C. $mgh$
• D. $2mgh$

Answer 1

The correct option is A $Zero$

A ball of mass $=m$

Height $=h$ in air

Initial velocity$=V$

Air resistance is considered negligible

The acceleration of free fall $=g$

Work done by the gravitational force on the ball during its flight from P and Q

$W=F\times dWorkdone=Force\times displacement$

Since displacement

will be $0$ Now

Work done $W=0$