require help on projectiles and trigonometry question

• October 31st 2012, 08:12 AM
aidanbk
require help on projectiles and trigonometry question
Hi all, I'd be extremely grateful if anyone could point me in the right direction on this question as I've been looking at it for half an hour now and nothing seems to be working. Thanks in advance!

Attachment 25490
• October 31st 2012, 10:45 AM
skeeter
Re: require help on projectiles and trigonometry question
$\Delta y = v_0\sin{\theta} \cdot t - \frac{g}{2} t^2$

$t = \frac{\Delta x}{v_0 \cos{\theta}}$

sub for $t$ ...

$\Delta y = \Delta x \tan{\theta} - \frac{g}{2} \cdot \frac{(\Delta x)^2 \sec^2{\theta}}{v_0^2} > h$

where $h$ is the height of the crossbar.
• October 31st 2012, 11:31 AM
aidanbk
Re: require help on projectiles and trigonometry question
Thank you very much :)