Physics (AS & A Level) · Oct / Nov 2019 · Paper 13 · Question 18

Initially, four identical uniform blocks, each of mass $m$ and thickness $h$, are spread on a table. The acceleration of free fall is $g$. How much work is done on the blocks in stacking them on top of one another?

1. A$3\,mgh$
2. B$6\,mgh$
3. C$8\,mgh$
4. D$10\,mgh$

As printed in the paper