Physics of Everyday Phenomena
Physics of Everyday Phenomena
9th Edition
ISBN: 9781259894008
Author: W. Thomas Griffith, Juliet Brosing Professor
Publisher: McGraw-Hill Education
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Chapter 3, Problem 7E

A ball is thrown upward with an initial velocity of 13 m/s. Using the approximate value of g = 10 m/s2, what are the magnitude and direction of the ball’s velocity:

  1. a. 1 second after it is thrown?
  2. b. 2 seconds after it is thrown?

(a)

Expert Solution
Check Mark
To determine

The magnitude and direction of the velocity of the ball 1s after it is thrown.

Answer to Problem 7E

The velocity of the ball is 3m/s in the upward direction.

Explanation of Solution

Given Info: A ball is thrown upward with initial velocity 13m/s. The value of g is 10m/s2.

Write the expression for the final velocity.

v=ugt

Here,

v is the final velocity

u is the initial velocity

g is the acceleration due to gravity

t is the time

Substitute 13m/s for u, 10m/s2 for g and 1s for t to get v.

v=13m/s(10m/s2)(1s)=+3m/s

The positive sign indicates the motion is in the upward direction.

Conclusion:

Thus, the velocity of the ball is 3m/s in the upward direction.

(b)

Expert Solution
Check Mark
To determine

The magnitude and direction of the velocity of the ball 2s after it is thrown.

Answer to Problem 7E

The velocity of the ball is 7m/s in the downward direction.

Explanation of Solution

Given Info: A ball is thrown upward with initial velocity 13m/s. The value of g is 10m/s2.

Write the expression for the final velocity.

v=ugt

Substitute 13m/s for u, 10m/s2 for g and 2s for t to get v.

v=13m/s(10m/s2)(2s)=7m/s

The negative sign indicates the motion is in the downward direction.

Conclusion:

Thus, the velocity of the ball is 7m/s in the downward direction.

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Chapter 3 Solutions

Physics of Everyday Phenomena

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