Posted by Hannah on Sunday, September 27, 2009 at 1:14pm.
An object is allowed to fall freely near the surface of an unknown planet. The object falls 80 meters from rest in 5.0 seconds. The acceleration due to gravity on that planet is?
Would the answer be 16?

Physics  MathMate, Sunday, September 27, 2009 at 2:46pm
The equation of kinematics for an object under freefall from rest:
h = v0 t + (1/2)at²
initial velocity, v0 = 0 m/s
acceleration, a m/s/s
height dropped, h m
time to drop, t seconds
Solve for a. 
Physics  JOHN, Monday, September 28, 2009 at 8:56pm
Half the acceleration is 16. I got 32 m/s^2 for the planet's acceleration.