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I'm new here but I have a physics question with my homework! hehe

We're working with dilution in gravity and we did a lab where we were to roll a marble down a ramp and record such variables as time and distance in order to afterwards calculate the acceleration and gravity force.

Basically, the problem I am having is that my calculated gravity for one of the exercices is 11.0 m/s^2 ! And I am wondering if this is usual considering that regular gravity is only 9.81 m/s^2. So, if the latter were diluted, wouldn't that decrease the amount?

The formulas we were told to use are a=2d/t^2 and g=a(d/h)

Please help me in any way possible! =) By the way, nice forum!

PS