View Single Post
i_heart_you
#1
Oct2-09, 12:41 PM
P: 5
1. The problem statement, all variables and given/known data
A ball is thrown with a speed of 70m/s and hits the top of a wall which is 20m tall and 100m away. Find the angle that the ball was thrown at


2. Relevant equations
d= V0xt + 1/2 a t^2
a = Vf-V0/t
sin^2(theta) = 1 - cos^2 (theta)

3. The attempt at a solution
I found the initial velocity in terms of theta V= 70cos(theta) x + 70sin(theta) y
the part i'm stuck on is apparently we are supposed to find the time from the horizontal displacement somehow. That i am stuck on because it seems like a i have too many variables and not enough information. any help is appriciated
1. The problem statement, all variables and given/known data



2. Relevant equations



3. The attempt at a solution
Phys.Org News Partner Science news on Phys.org
Experts defend operational earthquake forecasting, counter critiques
EU urged to convert TV frequencies to mobile broadband
Sierra Nevada freshwater runoff could drop 26 percent by 2100