Question

a body of mass 1 kg is dropped from a height of 5m on the ground

Answer 1

velocity with which it will reach the ground
$v = \sqrt{2gh} \\ v = \sqrt{2 \times 10 \times 5} \\ v = 10$
using 3 equation of motion
${v}^{2} = {u}^{2} - 2as \\ 0 = 100 - 0.04a \\ - 100 = - 0.04a \\ so \: a = 2500$
force =ma
so force=1×2500=2500N
HOPE IT HELPS

Answer 2

I hope the answer is
2510 N