student throws a set of keys vertically upward to hisfraternity brother, who is

Question

student throws a set of keys vertically upward to hisfraternity brother, who is in a window 4.00 m above. The brother's outstreched handcatches the keys 1.70 slater. (a) With what initial velocity were the keys thrown?
m/s
(b) What was the velocity of the keys just before they were caught?(Take upward as the positive direction.)
m/s
(a) With what initial velocity were the keys thrown?
m/s
(b) What was the velocity of the keys just before they were caught?(Take upward as the positive direction.)
m/s

Explanation / Answer

(a)    we use the equation of motion    s = u t + (1 / 2) a t2    - 4.00 m = u (1.70 s) + (1 / 2) (- 9.80 m /s2) (1.70 s)2    solve for the initial velocty u    solve for the initial velocty u (b)    in this case use theequation of motion    v = u + a t    solve for the final velocity v       

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