Question

A ball of mass $1kg$ thrown upwards reaches a maximum height of $5m$. Calculate the work done by the force of gravity during this vertical displacement.

• A. $-30J$
• B. $-48J$
• C. $-49J$
• D. $-59J$

Answer 1

The correct option is C $-49J$

Work done by gravity = change in potential energy

$=0-mgh$

$=-1\times 9.8\times 5=-49J$