A student throws a set of keys vertically upward to his fraternity brother, who is in a window 4.25 m above. The brother's outstretched hand catches the keys 1.65 s later. (Take upward as the positive direction. Indicate the direction with the sign of your answer.)   (a) With what initial velocity were the keys thrown?  in m/s  (b) What was the velocity of the keys just before they were caught?  in m/s

Principles of Physics: A Calculus-Based Text
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ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter2: Motion In One Dimension
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A student throws a set of keys vertically upward to his fraternity brother, who is in a window 4.25 m above. The brother's outstretched hand catches the keys 1.65 s later. (Take upward as the positive direction. Indicate the direction with the sign of your answer.)

 

(a) With what initial velocity were the keys thrown?  in m/s 

(b) What was the velocity of the keys just before they were caught?  in m/s 

 

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