Ideas on Null Hypothesis

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My project is to determine the relationship between elapsed time and distance traveled when a moving object is under the constant acceleration of gravity. What could I consider or is a possible null and alternative hypothesis for this?

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A null hypothesis describes that an examined effect is not significantly true, for instance you could say: “If an object is moving under the constant acceleration of gravity, then the distance traveled will have no bearings on the elapsed time”.

On the other hand, an alternative hypothesis states that there is some kind of statistically significant effect, meaning that there is a relationship between time and distance. For an alternative hypothesis, you could say that: “If an object is moving under the constant acceleration of gravity, then the distance traveled will be equal to half of the value of elapsed time multiplied by itself”