To find this in simplest form as an improper fraction, we need to convert the .48 into a fraction, then plug in the 2 and convert it into an improper fraction, and then simplify.
J j=agv where a is a constant of proportionality. j=1 when g=4 and v=5 1=a*4*5 1=20a a=1/20 a= 0.05 j=0.05gv When g=10 and v=9, j=0.05*10*9 j=0.5*9 j=4.5