Question

The velocity-time graph (v-t) of a car moving along a level road is shown below.The average speed of the car in the time interval 0 to 8 s is about

Answer 1

Answer:

Average speed = total distance/total time

the point at which the line intersects the x-axis can be calculated with the help of similarity of triangles

10/x=5/5-x

x=10/3s

area of the bigger triangle=1/2*10/3*10=100/6m

area of the smaller triangle=1/2*5/3*3=25/6m

area of rectangle=5*3=15m

total area= 100/6+25/6+15=215/6

Average speed=215/6*8=4.479m/s

Explanation: