Question

Can someone help me I don't understand ​

Answer 1

(a) 165 m/min

(b) 107.14m/min

Explanation:

The slope of the distance time graph gives speed.

Here, the speed of the segment A is

`v_A= (900-0)/(4-0)=225 m/min`

The speed of segment B is

`v_B= (1500- 900)/(14-4)= 60 m/min`

(a) The change in speed is

= 225 - 60 = 165 m/min

(b) The average speed is defined as the ratio of total distance to the total time.

So, the average speed is

`= (1500)/(14)= 107.14 m/min`