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# Tutor profile: Hannah W.

Inactive
Hannah W.
Second year Physics teacher and prior to this tutored for 5 years.
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## Questions

### Subject:Trigonometry

TutorMe
Question:

Kelly is trying to retrieve a frisbee on her roof that begins 10 feet above the ground. She has 13 foot ladder that will help climb to the top. At what angle above the horizontal must she place the ladder so that the top of ladder meets exactly with where the roof begins 10 feet above the ground?

Inactive
Hannah W.

### Subject:Physics

TutorMe
Question:

A 75 kg man slips off of the edge of a 3 story building. If the maximum amount of impact speed the human body can survive is about 14 m/s, ignoring air resistance, does the man survive the fall? (Each story is 3 meters)

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Hannah W.

Given that we are ignoring air resistance, mass is negligible for objects in free-fall motion. We can use basic kinematics to solve this problem. Given that $$\triangle v^2 = -2a\triangle y$$ with the acceleration due to gravity being -9.8 m/s and the fall height 9 meters (3 stories multiplied by 3 meters) we can substitute in to get $$\triangle v^2 = -2(-9.8)(9)$$. After some simplifying, we find that $$\triangle \sqrt v^2 =\sqrt(-2(-9.8)(9))$$ or $$\triangle v =13.28 m/s$$. He survived!!

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