Homework Help: physics

Posted by Kelly on Thursday, January 26, 2012 at 10:32am.

A soccer player kicks the ball toward a goal that is 27.8 m in front of him. The ball leaves his foot at a speed of 18.5 m/s and an angle of 30.4° above the ground. Find the speed of the ball when the goalie catches it in front of the net. (Note: The answer is not 18.5 m/s.)

ive done this problem 5 times and keep getting it wrong

physics - drwls, Thursday, January 26, 2012 at 11:14am
You need to know the distances above ground at which the ball was kicked and caught. Knowing those distances, you could use conservation of energy.

You would need to ignore aerodynamic forces to get an answer. This assumption will result in a significant error.

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