5. an athlete runs 5.4 laps around a circular track that is 400.0 m
long. if this takes 540 s, what is the average velocity of the athlete?
what is the average speed of the athlete over the complete
distance of the run?

Average velocity = 40 m/s

Average speed = 4 m/s

Explanation:

We are given;

Number of laps covered as 5.4 laps Distance for 1 complete lap is 400.0 m Time taken is 540 seconds

We are required to calculate the average velocity and the average speed of the athlete.

#1. Average velocity of the athlete

Velocity is a vector quantity given by dividing displacement with time taken.

In this case,

The displacement is 0.4 × 400 m = 160 mThis is because for the five complete laps displacement is zero because the athlete will be at the same starting point.Time taken for one lap is 540 s ÷ 5.4 = 100 sTherefore; for 0.4 laps time taken will be 0.4 × 100 = 40 s

Thus;

Velocity = Displacement ÷ time

             = 160 m ÷ 40 s

             = 40 m/s

The average velocity of the athlete is 40 m/s

#2. Average speed of the athlete

Speed is a scalar quantity calculated by dividing distance by time taken.

In this case;

Total distance is 5.4 × 400 m = 2160 m

time taken is 540 s

Therefore;

Speed = Distance ÷ time

           = 2160 m ÷ 540 s

           = 4 m/s

Thus, the average speed of the athlete is 4 m/s

Mass is the amount of matter in an object.  weight is the measurement of the pull of gravity on an object.  say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165)  now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon.  however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant.  in conclusion it is possible for your weight to change as your mass remains constant.