Câu 7: Một mạch điện xoay chiều có nguồn điện áp u(t) = 200 sin100 t, phụ tải gồm 3 điện trở R1 = 20 , R2 = 45 , R3 = 35 ghép nối tiếp nhau. Tính điện áp hiệu dụng trên từng điện trở? A. U1 = 90V, U2 = 40V, U3 = 70V
B. U1 = 45V, U2 = 20V, U3 = 35V
C. U1 = 40V, U2 = 90V, U3 = 70V
D. U1 = 30V, U2 = 50V, U3 = 20V

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You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero.