anonymous
  • anonymous
PROJECTILE MOTION A cannon shoots horizontally off a 90 m high cliff with a speed of 90 m/s. How much time until the cannonball hits the ground?
Physics
katieb
  • katieb
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matt101
  • matt101
All you're interested in is stuff going on in the vertical direction. This means its horizontal speed doesn't affect your answer. So what do we know? Starting vertical speed, v0 = 0 m/s (cannonball starts from rest) Vertical acceleration, a = 9.8 m/s^2 (gravity) Vertical distance, d = 90 m (height of the cliff) We want to find time, t. What equation can we use to solve for t using the variables we already have?
anonymous
  • anonymous
\( \color {maroon}{\text {This}~\text {is} ~ \text {what}~ \text {I've}~\text{done}\text{:}}\)\[\Delta_y=V_yt+\frac{1}{2}at^2\]\[-90=-4.9t^2\]\[t=4.29 s\] @matt101
matt101
  • matt101
Looks good!

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