TP 3.8

(a) q_r = tan^-1 (r_y/r_x) =  tan^-1 ((-9.50 m)/(14.0 m)) = -34.2^o

(b) r = ( r_x² + r_y²)^1/2 = ( (14.0 m)² + (-9.50 m)²)^1/2 = 16.9 m

(c) (a) will stay the same, (b) will double.