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## Homework Statement

A 100 kg box is being pulled along the x axis by a student. The box slides along the a rough surface and its position x varies accoring to the equation x=.5tcubed +2t, where x is in meters and t is in seconds.

a. Determine the speed of the box at t=0

b. 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.

c. Calculate the net workdone on the box in interval t=0 t t=2

d. Indicate below wheter the work done on the box by the student in the interval t=0 to t=2 wold e greater than, less than or eequal to the answer in part c.