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Problem: The position of a 260 g object is given (in meters) by x = 5.0t3 - 8.0t2 - 45t, where t is in seconds.(a) Determine the net rate of work done on this object at t =2.1 s.(b) Determine the net rate of work done on this object at t = 4.1 s.(c) What is the average net power input during the interval from t = 0 to t = 2.1  s?(d) What is the average net power input during the interval from t =2.1 s to t=4.1 s?

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Problem Details

The position of a 260 g object is given (in meters) by x = 5.0t3 - 8.0t2 - 45t, where t is in seconds.
(a) Determine the net rate of work done on this object at t =2.1 s.
(b) Determine the net rate of work done on this object at t = 4.1 s.
(c) What is the average net power input during the interval from t = 0 to t = 2.1  s?
(d) What is the average net power input during the interval from t =2.1 s to t=4.1 s?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Instantaneous Power concept. You can view video lessons to learn Instantaneous Power . Or if you need more Instantaneous Power practice, you can also practice Instantaneous Power practice problems.

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Our expert Physics tutor, Julia took 8 minutes and 40 seconds to solve this problem. You can follow their steps in the video explanation above.