- #1
orangegalaxies
- 50
- 16
- Homework Statement
- A soccer player kicks the ball in a parabolic arc to the opposite goal. The ball leaves the player’s foot at a speed of 27m/s, making an angle of 20 degrees above the horizontal. The mass of the ball is 0.43kg.
a. Determine the maximum height of the ball’s trajectory.
b. Determine the speed of the ball 3.5 m above the ground.
- Relevant Equations
- Ek = 1/2(m)v^2
Eg = mgh
a) So far, I have equated Ek to Eg to solve for h. 1/2(m)(27)^2 = m(9.8)h. I haven't taken the angle into consideration. I'm not sure if I have to use the x or y component. I got my answer to be 37m but again I don't believe this is correct.
b) I did Ek = Eg + Ek. 1/2(m)(27)^2 = m(9.8)(3.5) + 1/2(m)(v^2). I got v = 26m/s but I don't know if this is the right way to do it since I didn't use the angle again.
b) I did Ek = Eg + Ek. 1/2(m)(27)^2 = m(9.8)(3.5) + 1/2(m)(v^2). I got v = 26m/s but I don't know if this is the right way to do it since I didn't use the angle again.