Question

a stone of mass 200 grams falls from a height of 5 metre into a pile of sand the stone Pinterest send and stops after describing a distance of 5 cm find the force exerted by the centre on the stone

Answer 1

$v^{2} - u^{2}  = 2as$

$v=\sqrt{2*10*5} =10 m/s$

After reaching the sand,

$v^{2} - u^{2}  = 2as$

$a=-u^{2}/2s=-1000 m/s^{2}$

F=ma

F=0.2*1000=200 N

Note: Take care about the units.