After a touchdown a wide receiver threw a football into the stands to his girlfriend 139 meter through the air. While in flight, the football traveled at an average speed of 13.0 m/s. How long did the football remain in the air?

Expert Answers

An illustration of the letter 'A' in a speech bubbles

The distance traveled by the ball is given as 139 m and the average speed of the ball (through the air) is 13 m/s. Speed is defined as the ratio of distance traveled to time taken. In other words,

speed =distance/time

or, time = distance/speed

Thus, the time spent by the ball in air can be calculated as the ratio of distance and average speed.

or, time spent by the ball in air = `(139 m) / (13 m/s)` =10.69 s

Thus, the ball spent 10.69 s in air for its travel from wide receiver to his girlfriend in the stands. 

A number of other calculations can be done on similar problems by using equation of trajectory and related equations of motion of objects. For example, we can calculate the maximum height attained by the ball as it was thrown from one player to the other.

Hope this helps. 

Approved by eNotes Editorial Team

We’ll help your grades soar

Start your 48-hour free trial and unlock all the summaries, Q&A, and analyses you need to get better grades now.

  • 30,000+ book summaries
  • 20% study tools discount
  • Ad-free content
  • PDF downloads
  • 300,000+ answers
  • 5-star customer support
Start your 48-Hour Free Trial