The elastic potential energy of a spring can be said to be the energy possessed by a spring due to a force that compresses or stretches the spring. This can also be said to be the work which is done by the applied force against the restoring force of the spring, which is stored as the elastic potential energy.
The elastic potential of a spring can be expressed as:
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I believe that formula is incomplete, if it is derived from the kinematic equations.
The full formula being
where:
s is the displacement (or how far she travelled in your question)
u is the initial velocity, which I think can be assumed to be 0 m/s
t is the time taken which is 120 s
a is the acceleration due to gravity which points down in a negative y direction, which is -9.8 m/
Since initial velocity, u, is assumed to be 0 m/s the equation becomes:
Substitute in a = -9.8m/ and t = 120 s and calculate your answer.
Tell me what you calculate the answer to be (don't forget units) and I'll let you know if it's right.
Answer:
true
Explanation:
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To provide a greater certainty that the observed results are not by chance.
The question doesn't describe any experiment. If the same experiment is repeated, no matter how many times, the acceleration due to gravity will remain the same as it was during the non-existent original experiment, and will have no effect on anything.