



 
Hi Patricia. The general equation of motion for an object under constant acceleration (like that due to gravity in your question) is this: d=v_{0 }t+½at^{2 } where d is the displacement (distance), v_{0} is the initial velocity, a is the constant acceleration and t is the time. In your case, you know d is 1000 m, v_{0} is 0 (it is dropped, not thrown), a is the standard for earth's gravity (9.8 m/s^{2 }) and you want to find t, which will be the time in seconds . Substitute these into the equation and solve for t. Hope this helps,  


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