March 13th, 2018, 03:08 AM  #1 
Senior Member Joined: Nov 2010 From: Indonesia Posts: 2,001 Thanks: 132 Math Focus: Trigonometry  [ASK] Kicked Ball
In a soccer match Putu kicked the ball with the elevation angle $\displaystyle \alpha$ so that it reached the maximum height 10 m. How long must he wait until the ball fall to the ground if g = $\displaystyle 10m/s^2$? I don't know how to do it if the initial velocity isn't known. Can someone help me? 
March 13th, 2018, 03:43 PM  #2  
Math Team Joined: Jul 2011 From: Texas Posts: 2,817 Thanks: 1460  Quote:
at the max height, $v_y = 0$ ... $10 = 0  5t^2$ solve for $t$  
March 13th, 2018, 05:07 PM  #3 
Senior Member Joined: Nov 2010 From: Indonesia Posts: 2,001 Thanks: 132 Math Focus: Trigonometry 
$\displaystyle t=\sqrt2$?


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