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dacruick
#4
Dec20-11, 11:40 AM
P: 1,084
Kicked ball hits bird and falls

Quote Quote by HelpMeh View Post
so i need to use energy twice, the second time being right before and after the impact?
Well, they give you the initial conditions, which are the speed and angle of the trajectory.

With this, you should be able to calculate the maximum height (using the y component of the trajectory speed). Once it hits the bird, it falls straight down (in other words, the x component of velocity goes to 0 upon impact).

Beyond that, I don't really find it necessary to tell you how to solve the question, as I'm sure there are many ways.

HINT: If the impact occurs at the top of the trajectory, the y-component of the velocity is 0 at that time.