Finding Acceleration of Gravity of Fictional Planet

[to819]

In preparation for my upcoming first exam I was doing all of the suggested problems throughout the chapters. Everything was fine until this problem:

Homework Statement

An astronaut on the planet Zircon tosses a rock horizontally with a speed of 6.95m/s. The rock falls through a vertical distance of 1.4m and lands a horizontal distance of 8.75m from the astronaut. What is the acceleration of gravity on Zircon?

Homework Equations

Distance=speed x time
Speed=distance/time

The Attempt at a Solution

8.75m/6.95m/s=1.26s

1.4m/1.26s=1.11m/s

Now, I thought this was correct but according to the back of the book the answer is 1.77m/s which would be 1.4*1.26. Am I misunderstanding something?

 

[Janus]

You found the speed of the rock if it fell at a constant speed. You are meant to find the acceleration of the rock. You need to use an equation that relates time, distance and acceleration.

 

[kellenm]

Are you doing projectile motion?