Name:____________________________ Class : ____________________

Exercise

Speed (ms-1)

24

u

time (s) 0 4 9 15

1. The speed-time graph shows the movement of an object for a period of 15 seconds.a) state the length of time, in seconds, that the object moves at a uniform speedb) calculate the rate of change in speed, in ms-2 in the last 6 secondsc) calculate the value of u, if the distance travelled in the first 9 seconds is 180m

speed (ms-1)

8

Time (s) 0 4 12 t 26

2. The speed-time graph shows the movement of a particle for a period of 26 seconds. Calculatea) the rate of change in speed, in ms-2 in the first 4 secondsb) the value of t, if the distance travelled in the last 14 seconds is 120m

Time (s)

12

18

Speed ms-1

40

0 6 15 t

3. The speed-time graph shows the movement of a particle of t seconds. Calculatea) the acceleration, in ms-2, in the first 6 secondsb)the distance travelled at a uniform speedc) the value of t, if the average speed for the period of t seconds is 29 ms-1