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Projectile Motion, with only Displacement and Angle Known.

  • Thread starter n72.75
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Homework Statement


A projectile is fired at an angle of 35° and lands 88.5 Meters Down Range.
Assume no air resistance, and a gravatational acceleration of 9.80665 M/S2

I can get as far as the trig, but it doesn't seem like there is enough information to find time or velocity.

Find Initial Velocity Of the Projectile.


Homework Equations


a = [tex]\frac{(V f - V i) }{ t }[/tex]
s = V i + [tex]\frac{1}{2}[/tex] at 2

The Attempt at a Solution



See Attachment.
 

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Answers and Replies

  • #2
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Break up the motion into x&y components.

Since you know the distance, you can write an equation linking Vi and T (total time). Similarly because horizontal speed doesn't change, you can write an equation linking Vi and N=T/2.

Now, what happens when projectile is halfway there (with respect to the y-component of speed)?
 
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