Horizontal Projectile Motion

  • Thread starter harujina
  • Start date
  • #1
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Homework Statement



A ball is thrown horizontally from the top of a building and lands 20.0m away from it. If the ball is initially thrown at a velocity of 10.0m/s, how high is the building? How long does it take for the ball to reach the ground?

Homework Equations



dv = Viv * t + 1/2a * t

The Attempt at a Solution



dh (horiz.distance) = 20.0m
Vh = 10.0m/s
Viv (vertical init. velocity) = 0m/s
a = -9.8m/s
dv (vert. distance) = ?
t = ?

I'm confused because I'm missing two of the variables which are needed in the equation that will solve this problem...? (dv and t)
 

Answers and Replies

  • #2
NascentOxygen
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The horizontal velocity of the ball is fixed and constant during the whole time of flight. Knowing this, you can determine the time of flight.
 
  • #3
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Using the same equation as the one stated above? Because that one's giving me a totally wrong answer.
 
  • #4
haruspex
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Using the same equation as the one stated above? Because that one's giving me a totally wrong answer.
Yes, the same equation, but of course in the horizontal direction a = 0. pls post your working.
 

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