Question

Starting from rest at time t = 0, a car moves in a straight line with an acceleration given by the accompanying graph. What is the speed of the car at t = 3s?

 

 (A) 1.0m/s 

(B) 2.0m/s 

(C) 6.0m/s 

(D) 10.5m/s 

(E) 12.5m/s

Answer 1

Correct option (D) 10.5 m/s

The area under the curve of an acceleration-time graph is the change in speed.