- #1
kLPantera
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Homework Statement
Problem #1
A ball is thrown horizontally from the roof of a building 56m tall and lands 45m from the base. What was the ball's initial speed.
Problem #2
A ball thrown horizontally at 22.2m/s from the roof of a building lands 36.0 meters from the base of the building. How high is the building?
Homework Equations
Problem #1
Not sure which equation(s) I need to use. I know I have to find initial speed, but I think I have to find time to find initial speed. So I'm unsure as to how to find time, because time keeps giving me some trouble.
Problem #2
x=Vot + (1/2)at2
y=Vot + (1/2)gt2
The Attempt at a Solution
Problem #1
Don't know which equation(s) to use so, no attempt.
Problem #2 (Could someone please confirm my calculations for this one?)
Delta x = 36
Delta y = ?
Vo = 22
ax = 0
ay = -9.8m/s2
t = ?
x = Vot+ (1/2)at2
36 = 22t
t = 1.6 seconds
y = Vot + (1/2)at2
y = (22)(1.6) + (1/2)(-9.8)(1.6)2
y = 35.2 - 12.544
y = 22.656
Thanks