Two vectors have magnitudes 3.0 and 4.0. How are the directions of the two vectors related if?

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Two vectors have magnitudes 3.0 and 4.0. How are the directions of the two vectors related if?
(a) The sum has magnitude 7.0, or
(b) If the sum has magnitude 5.0?
(c) What relationship between the directions gives the smallest magnitude sum and what is this magnitude?
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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