Question

A toy car moves 3.0 m to the North in one second. The car then moves at 9.0 m/s due South for two seconds. What is the average speed of the car for this three second trip? 

(A) 4.0 m/s 

(B) 5.0 m/s 

(C) 6.0 m/s 

(D) 7.0 m/s 

(E) 12 m/s

Answer 1

Correct option (D) 7.0 m/s

Average speed = (total distance)/(total time)