Question

an object of mass 4kg falls freely from a height of 100cm onto a muddy ground and comes to rest in the middle. calculate the distance the body penetrates if the average retarding force on it is 20N (g=10m/s^2)?

Answer 1

here u= 0
v= 0 according to work energy theorem
mgh - 20×x= 0
4×1×10 - 20x=0
40-20x=0
x=2 m

Answer 2

an object of mass 4kg falls freely from a height of 100cm onto a muddy ground and comes to rest in the middle. calculate the distance the body penetrates if the average retarding force on it is 20N (g=10m/s^2)?
here u= 0
v= 0 according to work energy theorem
mgh - 20×x= 0
4×1×10 - 20x=0
40-20