An object starts from the origin and goes along the x-axis to x = 10 m in 2 s,stops for 5.5 s,and then travels at v = -4 m/s for 2.5 s? What is the average speed and velocity in m/s?
A)speed = 2,velocity = 2
B)speed = 2,velocity = 0
C)speed = 2,velocity = -2
D)speed = 0,velocity = 0
E)speed = 4,velocity = 0

Question

Quizplus · Accepted Answer

The total distance traveled is 20 m (10 m forward and 10 m backward). The total time is 10 s (2 s + 5.5 s + 2.5 s). Average speed = total distance/total time = 20 m/10 s = 2 m/s. The net displacement is 0 m (10 m forward and 10 m backward), so average velocity = net displacement/total time = 0 m/10 s = 0 m/s.

An Object Starts from the Origin and Goes Along the X-Axis