Answer:
(a)
(b)
Explanation:
The average power is defined as the amount of work done during a time interval:
According to work-energy theorem, the work done is equal to the change in kinetic energy. So, we have:
Recall that the weight is given by:
The car accelerates uniformly from rest (). Replacing (3) in (2), we have:
(a) Finally, we replace this in (1):
(b)