Which of the following is the best coordinate system to analyze a painter climbing a ladder at an angle of 60° to the ground?
a.
x-axis: horizontal along the ground; y-axis: along the ladder
b.
x-axis: along the ladder; y-axis: horizontal along the ground
c.
x-axis: horizontal along the ground; y-axis: up and down
d.
x-axis: along the ladder; y-axis: up and down