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General Physics

Cool goIITian

 Joined: 28 May 2012 Post: 49
20 Jul 2012 15:00:49 IST
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Engineering Entrance , Medical Entrance , AIPMT , JEE Main , AIIMS , JEE Advanced , Physics

Given that for a projectile the time is 't'. y=5t-8(t^2)  and   x=12t.So the velocity is:

1)5m/s

2)12m/s

3)13m/s

Blazing goIITian

Joined: 26 May 2010
Posts: 1362
20 Jul 2012 17:05:20 IST
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3) option 13m/s .....see if u put t as x/12 in the y eq ..u get the equation of projectile....and comparing with it ..u get tan theta as 5/12 .....so u have cos theta as 12/13 and hence x = speed in x direction * time ......=12*t ---->u*cos theta =12 ....that gives u as 13m/s!

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