Question

If an object of mass 1000kg moving with an speed of 20m/s brought to rest and travelled 50m.Find the actual force applied by the brakes may be slightly leas than the calculated in and why

Answer 1

v²-u²=2as

v=0

-u²=2as

-400=2×a×50

a=-4m/s².

F=m×a

F=1000×4

F=4000.