- #1

huybinhs

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## Homework Statement

The trajectory of a rock thrown from a height with an initial speed of 16.9 m/s is shown in the figure below. Evaluate the magnitude of the gravitational field at the surface of the planet. The planet has no atmosphere.

The graph is as follow:

http://i995.photobucket.com/albums/af79/huybinhs/plot-1.png

## Homework Equations

g = G*M/R²

a = v^2 / r

## The Attempt at a Solution

I know using g = G*M/R² to find magnitude of the gravitational field. In order to find R using a = v^2 / r; but I don't know how to find a from the graph. Please help! Thanks!

Note: I'm not sure if my tried solution is correct or not. Please advise!