# A student throws a set of keys vertically upward to his fraternitybrother, who is in a window 4.00 m above. The brother’soutstretched hand catches the keys 1.50 s later. (a) With whatinitial velocity were the keys thrown? (b)? What was the velocityof the keys just before they were caught?

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A student throws a set of keys vertically upward to his fraternity
brother, who is in a window 4.00 m above. The brother’s
outstretched hand catches the keys 1.50 s later. (a) With what
initial velocity were the keys thrown? (b)? What was the velocity
of the keys just before they were caught?

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Step 1

(a)Write the kinematic equation of motion.

Step 2

(b)The time of ascent of the key is.

Step 3

The time of falling from ...

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