A gray kangaroo can bound across a flat stretch of ground with each jump carrying it 10m from the takeoff point. If the kangaroo leaves the ground at a 20* angle, what are its (a) take off speed and (b)horizontal speed ?

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter3: Motion In Two Dimensions
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A gray kangaroo can bound across a flat stretch of ground with each jump carrying it 10m from the takeoff point. If the kangaroo leaves the ground at a 20* angle, what are its (a) take off speed and (b)horizontal speed ?

Knight College Physics 4th Chapter 3 Q-33 

Could you please explain the algebra substitution more in-depth I am confused as to why I missing the square root in my calculations. 

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