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

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?