A flowerpot falls of a window sill and falls past the window below. It takes 0.5 s to pass through a 2.0 m high window. Find how high is the window sill from top of a window?

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7.5 cm

15 cm

10 cm

11.25 cm

answer is C.

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Detailed Solution

$\begin{array}{l} h = u t + \frac{1}{2} g t^{2} \\ 2 = u (\frac{1}{2}) + \frac{1}{2} \times 10 \times \frac{1}{4} \\ u = 1.5 \frac{m}{s} \end{array} h = \frac{u^{2}}{2 g} = \frac{1.5 \times 1.5}{2 \times 10} = 11.25 c m$

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