# Homework Help: Projectile Motion difficulty

1. Oct 1, 2007

### SharkFin39

1. The problem statement, all variables and given/known data

How far will a stone travel over level ground if it is thrown upward at an angle of 35 degrees with respect to the horizontal and with a speed of 20 m/s?

What is the maximum range that can be achieved if a stone is thrown with an initial speed of 24 m/s?

3. The attempt at a solution

I've worked out both questions using the formula:

R = (Vo^2*sin(2 theta)) / g

For the first question I calculated a distance of 38.35m, and for the second (using the angle 45°) 58.77m. However, both of the answers have been marked incorrect. I've tried different sig figs etc. Am I doing something wrong? Is there any other way to solve these two problems? Thank you in advance for any help!

Sincerely,
SharkFin

2. Oct 1, 2007

### mgb_phys

Not sure where you got that formula but, 38.35 and 58.77 is correct assuming they mean the stone is thrown with that speed along that angle.