You are standing due east of a car travelling southwest. What is the direction of the car's angular momentum around you

Kinetic energy = 1/2mv^2. since the mass is constant we can form a ratio of it's kinetic energy at 60 divided by that at 30 to see ke(60)/ke(30) = +(60^2)/30^2). this may be said to 300% increase.

Your answer is 1.5 hope i  

The independent variable would be the fertilizer as it is what the dependent variable (the growth of grass) depends on.