Answer to Question #309018 in Mechanics | Relativity for Hntuff

Question

A flower pot is accidentally dropped from a building window 400m from the ground. Assuming it starts from rest, a How long will it take the pot to reach the ground?

Answer 1

Explanations & Calculations

• Initial velocity is given, the displacement it would make is given, and the acceleration is the gravitational acceleration.
• So, with these apply $\small s =ut+1/2 at^2$ for the pot's fall downwards.

$\qquad\qquad \begin{aligned} \small 400\,m&=\small 0t+\frac{1}{2}\times (+9.8\,ms^{-2})\times t^2\\ \small t^2&=\small \frac{400m\times2}{9.8\,ms^{-2}} \\ &=\small 81.6\,s \end{aligned}$