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College Physics

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

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BuyFindarrow_forward

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 3.00s for tflight .

t=3.00s2=1.50s

The equation for vertical velocity is,

vy=v0y+ayt

Substitute 0m/s for vy , 9.80m/s2 for ay and 1

(b)

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

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