A block of mass m initially at rest is dropped from a height $h$ on to a spring of force constant $k$. the maximum compression in the spring is $x$ then
- A$mgh = \frac{1}{2}k{x^2}$
- B$mg(h + x) = \frac{1}{2}k{x^2}$
- C$mgh = \frac{1}{2}k{(x + h)^2}$
- D$mg(h + x) = \frac{1}{2}k{(x + h)^2}$
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