[اسامة احمد على]

ma=mg sinθ-Rmg
then a=gsinθ-Rg U=44.1 km/h=12.25 m/sec
V=u+at then 0+a×250=12.25 a=0.049
If R is the resistance per ton

then
R=(9.8×0.01-0.049)/9.8