In order to find this, we need to first multiply these as if they have no decimal places.
51*24 = 1224
Now, we count the number of decimals in the original equation and move the decimal place that many times. Since there are 4 numbers after decimals in the original equation, we put 4 after in the answer.
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