Joseph deloach of the united states set an olympic record in 1988 for the 200-meter dash with a time of 19.75 seconds. what was his average speed? give your answer in meters per second and miles per hour.

The average speed was 10.12 m/s or 22.96 mi/h

Explanation:

The average speed is defined as:

  (1)

Where d is the total distance traveled and t is the passed time.

For the special case of Joseph DeLoach, he traveled a total distance of 200 meters in 19.75 seconds. Those values can be introduced in equation 1:

That means that Joseph DeLoach traveled a distance of 10.12 meters per second.

To represent the result in miles per hour, it is necessary to know that 1 mile is equivalent to 1609 meters.

⇒ 0.124 mi

it is needed to express the given time in units of hour. 1 hour is equivalent to 3600 seconds.

⇒ 0.0054 h

Then, equation 1 is used with the new representation of the values.

we need to know the time interval during which the force acts. impulse of force = momentum change

at right angles to each other