Chapter 3, Problem 42AP

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

Chapter
Section

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

# A ball is thrown straight upward and returns to the thrower’s hand after 3.00 s in the air. A second ball thrown at an angle of 30.0° with the horizontal reaches the same maximum height as the first ball, (a) At what speed was the first ball thrown? (b) At what speed was the second ball thrown?

(a)

To determine
The speed with which the first ball was thrown.

Explanation

The time to reach the maximum height is half the time of flight.

t=12tflight

Substitute 3.00â€‰s for tflight .

t=3.00â€‰s2=1.50â€‰s

The equation for vertical velocity is,

vy=v0y+ayt

Substitute 0â€‰m/s for vy , âˆ’9.80â€‰m/s2 for ay and 1

(b)

To determine
The speed with which the second ball was thrown.

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