Question

Show how the displacement of a runner changed during a sprint race.draw a displacement-time graph to show this data, and use it to deduce the runner's speed in the middle of the race.
Displacement (m) 0 4 10 20 50 80 105,
Time(s) 0 1 2 3 6 9 12.

Answer 1

He is not running at constant speed.
Notice that he goes 4 meters in the first second and 6 meters in the second second
speed versus time
change in distance/change in time
4/1 = 4
(10-4) /1 = 6
(20-10)/1 = 10
(50-20)/3 = 10
(80-50)/3 = 10
(105-80)/3 = 25/3 = 8 1/3
looks like 10 m/s is speed in the middle

Answer 2

Grade 9

Answer 3

To draw displacement time graph

Answer 4

Draw the displacement_time graph of this