Robert, a stuntman, projects himself from a height of
50.0 meters in a horizontal direction. He safely lands at a horizontal distance of 100.0 meters. Calculate the horizontal velocity with which Robert projected himself. which of the following answers are correct: 4.90 m/s, 9.40 m/s, 10.20 m/s, or 12.20 m/s

Question

festinger · Answer

$$h=\frac{1}{2}*g*t^2$$
solving for t, t = 3.19s

$$horizontal\:speed=\frac{horizontal\:distance}{time}=\frac{100}{3.19}=31.3m/s$$

anonymous · Answer

which of the following answers are correct: 4.90 m/s, 9.40 m/s, 10.20 m/s, or 12.20 m/s

festinger · Answer

I really don't know. http://answers.yahoo.com/question/index?qid=20120203084734AADIVoq

festinger · Answer

Unless the gravity in this question is supposed to be at another value.

anonymous · Answer

well what would it be if gravity were in the question?

festinger · Answer

each of the answers will give a value for gravity g. When solving it I used the value 9.8. What does the question want you to use?

anonymous · Answer

it doesn't say

festinger · Answer

Sorry, I guess you have to wait for someone else to help.

anonymous · Answer

ok and it's fine, you've helped a lot