Concept explainers
To calculate: The time for which the ball is in the air.
Answer to Problem 61E
The required time for which the ball is in the air is 5.66 seconds.
Explanation of Solution
Given information:
The initial height of the ball = 7 feet
The initial vertical velocity = 90 feet
The height of the ball when the other player catches it = 3 feet
Formula used:
Calculation:
Consider the required time be t , the initial height be
So,
The model of the throwing of the ball can be written as:
Substitute 90 for
To solve the above equation for t , use the quadratic formula
Substitute −45 for b , 8 for a and −2 for c in the above formula.
Solve for t further.
And,
The value of t cannot be negative.
Hence, the required time for which the ball is in the air is 5.66 seconds.
Chapter 3 Solutions
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