The normal force would be the opposing and equal force to gravity ... that is why the box isn't floating or going through the ground ... this is Newton's third law of motion
Answer:
There is at least one instant which instantaneous acceleration is equal to average acceleration.
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Explanation:
The average acceleration experimented by the car is:


According to the Rolle's Theorem, there is at least one instant t so that instantaneous acceleration equal to average acceleration for the analyzed interval. That is to say:

If car is accelerating at constant rate, instantaneous acceleration coincides with average acceleration for all instant t. Then, instantaneous acceleration is:

Complete Question
The complete quetion is shown on the first uploaded image
Answer:
Explanation:
From the question we are told that
The mass of the fly is 
The extension of the web is 
The spring constant is mathematically evaluated as

substituting values


The frequency of vibration is

substituting values


Answer:
accuracy refers to the deviation of a measurement from a standard or true value of the quantity being measured