Question

# A student throws a set of keys vertically upward to her sorority sister, who is in a window 4.00 m above. The second student 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?

Solution

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$\text{\underline{\textbf{Given Data}}}$:

$y_i=\textcolor{#c34632}{0\;\mathrm{m}}$

$y_f=\textcolor{#c34632}{4\;\mathrm{m}}$

$t=\textcolor{#c34632}{1.5\;\mathrm{s}}$

$a=-g=\textcolor{#c34632}{-9.8\;\mathrm{m/s^2}}$