Question

Which of the following has the highest Potential energy?

• A. 10 kg stone at a height of 20 m
• B. 100 kg stone at a height of 2 m
• C. 40 kg stone at a height of 5 m
• D. 30 kg stone at a height of 7 m

Answer 1

The correct option is D 30 kg stone at a height of 7 m

We know that, $P.E.=mgh$

Since, $g$ is same for all the options, we take $g=10m/s$.

So, (A) P.E $=mgh=10\ast 20\ast 10=2000J$

(B) P.E $=mgh=100\ast 2\ast 10=2000J$

(C) P.E $=mgh=40\ast 5\ast 10=2000J$

(D) P.E $=mgh=30\ast 7\ast 10=2100J$

So, From above, we can conclude that option (D) $30kg$ stone at a height of $7m$ has the maximum $P.E.$