The figure shows the position of a car (black circles)at one second intervals.What is the velocity at the time t = 4 s?
A)-12 m/s
B)-8 m/s
C)0
D)8 m/s
E)12 m/s

Question

The figure shows the position of a car (black circles)at one second intervals.What is the velocity at the time t = 4 s? 
A)-12 m/s 
B)-8 m/s 
C)0 
D)8 m/s 
E)12 m/s

Quizplus · Accepted Answer

The velocity is given by the formula v = Δx/Δt, where Δx is the change in position and Δt is the change in time. Between t = 3 s and t = 4 s, the car moves 8 meters to the right (from x = 4 m to x = 12 m). Therefore, the velocity at t = 4 s is v = 8 m/1 s = 8 m/s to the right. The correct answer is D.

The Figure Shows the Position of a Car (Black Circles)at