Question

a person joke 8 complete lap around a quarter Mile tracking total time 13.5 min
calculate average speed and average velocity in metre per second​

Answer 1

Answer:

Average speed

First of all, we need to convert the total time from minutes to seconds. Keeping in mind that 1 min = 60 s, we have

t=14.9 min \cdot 60 s/min =894 st=14.9min⋅60s/min=894s

Each lap is 400 m, and the person completes 8 laps, so the total distance covered by the person is

S=8 \cdot 400 m=3200 mS=8⋅400m=3200m

The average speed is just the ratio between the total distance and the total time:

v=\frac{S}{t}=\frac{3200 m}{894 s}=3.6 m/sv=tS=894s3200m=3.6m/s

2) Average velocity

The average velocity is equal to the ratio between the total displacement of the person and the total time:

v=\frac{d}{t}v=td

however, the total displacement is zero, because the person returns to his starting point (the track is a closed circuit). Therefore, d=0 and the average velocity is zero as well:

v=0v=0