- #1
Myung
- 42
- 0
Homework Statement
A ball is thrown by Jed in the street and caught 2 seconds later by Jelo on the balcony of the house 15m away and 5.0m above the street level. What was the speed of the ball and the angle above the horizontal at which it was thrown?
Homework Equations
The Attempt at a Solution
My attempt for the solution is first get the V(Vertical)
2g(Vertical Max) = Vy^2 - Vyi^2
(Vy at top is 0 so...)
2(-9.8)(5)=-Vyi^2
and i got:
Vyi = 9.9 m/s
Then I want to get my Vxi
Range = Vxi (t)
Vxi = Range / t
Vxi = 15 / 2
Vxi = 7.5 m/s
Vi of the ball = sqrt[(7.5)^2 +(9.9)^2]
Vi = 12.42 m/s
To get angle I used the formula:
Vxi = Vi cos x
x = Cos-1 ( Vxi / Vi )
x = Cos-1 ( 7.5 / 12.42 )
x = 52.85 degrees
Am i doing it right? >.<