(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A driven golf ball just clears the top of a tree that is 15m in height, and 30 m from the tee. The ball then lands on the green 180m from the tee.

(a) What was the initial speed imparted to the golf ball?

(b) At what angle did the golf ball leave the tee?

2. Relevant equations

(a) V^{2}=V_{i}^{2}+ 2aΔx

3. The attempt at a solution

(a) V^{2}=V_{i}^{2}+ 2aΔx

0=V_{i}^{2}+ 2(-9.8 m/s^{2})(180 m)

V_{i}^{2}=3528

V_{i}=59.4 m/2

I feel like I might be missing something because I wasn't sure if the 9.8 was supposed to be negative or positive...

(b) tan X = 15m/30m

arctan(1/2) = X

X = 26.57 degrees

Can I make this assumption based on the information from the problem? The only thing I wasn't sure about was if I could make a straight hypotenuse from the starting point to the top of the 15m?

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# Homework Help: Finding velocity after displacement, and an angle

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