+0  
 
0
555
1
avatar

a stone is thrown horizontally with an initial speed of 10 m/s from a bridge. Assuming that air resistance is negligible, how long would it take the stone to strike water 80 m below the bridge?

Guest Apr 28, 2017
 #1
avatar+7348 
+1

a stone is thrown horizontally with an initial speed of 10 m/s from a bridge. Assuming that air resistance is negligible, how long would it take the stone to strike water 80 m below the bridge?

 

The stone falls downwards with gravity, regardless of its horizontal movement.

 

\(freefall:\\v=gt\\s=\frac{1}{2}gt^2\\t=\sqrt{\frac{2h}{g}}\\v=\sqrt{2gh}\)

 

\(g=9.81m/sec^2\\h=80m\\\color{blue}t=\sqrt{\frac{2h}{g}}\)

 

\(t=\sqrt{\frac{2\cdot 80m}{9.81m/sec^2}}\)

 

\(t=4.04\ sec\) 

 

laugh  !

asinus  Apr 28, 2017
edited by asinus  Apr 28, 2017
edited by asinus  Apr 29, 2017

11 Online Users

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.