試題詳解

41. Car A leaves point O at t = 0 and travels counterclockwisely along a quarter circle of radius 100 m at constant speed 30.0 m/s to reach point P. Car B is supposed to leave point O and travels to point P at the same speed but along a straight line. At what time should car B leave point O in order to arrive at point P at the same time as car A?
(A)t=-4.71 s
(B)t=-0.53s
(C)t=0
(D)t=0.53s
(E)t=4.71s