You push an object across a floor by exerting a constant 210N force on it. From t=0 to t=8s the object slides 12m across a carpeted floor. From t=8s to t=11s the object slides an unknown distance d across a wood floor.

a) You supply an average power of 286W while pushing the box. Use this to find the distance d.

b) At t=2s the box is moving with a speed of 0.8m/s. What is the instantaneous power you supply at this time?