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Author Question: A projectile is fired from the ground at an angle of 30 degrees above the horizontal,? (Read 978 times)

Hawke

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on: Jun 23, 2013
and it lands 150 meters away. Find (a) the initial velocity of the projectile and (b) the maximum height it reaches.


coco

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Reply #1 on: Jun 23, 2013
Use the following equations:

Hmax = (v0^2*sin^2(theta))/2*g

R = range = (vo^2*sin(2*(theta)))/g

since the range is given, we can use it to find the initial velocity:

150*9.8 = vo^2*.866  so  vo^2 = 1697.46  and v0 = 41.2 m/s

Now use v0 to find the max height:

Hmax = 1697.46*.25/19.6 = 21.65 m


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Hawke

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Reply #2 on: Jul 3, 2013
Thanks ;) It was right.


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