Question

The velocity of a body of mass 20 kg decreases from 20
m/s to 5 m/s in a distance of 100 m force on the body is​

Answer 1

v$v^{2} = u^{2} +2as$

25-400/200=a

a=-375/200

f=ma

F= 20x-375/200

F=-37.5N