PhysicsLAB AP Free Response Question
2003 C1

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The 100 kg box shown above is being pulled along the x-axis by a student. The box slides across a rough surface, and its position x varies with time t according to the equation x = 0.5t3 + 2t, where x is in meters and t is in seconds.
 Determine the speed of the box at time t = 0.

Determine the following as functions of time t. 
i. The kinetic energy of the box

 ii. The net force acting on the box

 iii. The power being delivered to the box

 Calculate the net work done on the box in the interval t = 0 to t = 2 s.

Indicate below whether the work done on the box by the student in the interval t = 0 to t = 2 s would be greater than, less than, or equal to the answer in part (c).

____Greater than _____Less than _____Equal to
Justify your answer.

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