Question
Why does a child feel more pain when she falls down on a hard cement floor, than when she falls on the soft muddy ground in the garden?

Answer

The effect of force F = ma. i.e., if the mass is constant for a system to decrease force, the ‘a’ should be decreased $\text{a}=\frac{(\text{v}-\text{u})}{\text{t}}$ initial and final velocity of falling body on a surface are u and zero. so it cannot be changed. If time during hitting is increased, the acceleration decreased and force will decrease.
On cemented hard floor the time to stop after fall on it is very-very small. But when she/he falls on soft ground of garden she/ he sinks in ground and takes more time to stop hence smaller force or pain acts on her/ him.

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