A 1500 kg car starts from rest on a horizontal road and gains a speed of 72

Question:

A 1500 kg car starts from rest on a horizontal road and gains a speed of 72 km/h in 30 s.
(a) What is its kinetic energy at the end of the 30 s?
(b) What is the average power required of the car during the 30 s interval?
(c) What is the instantaneous power at the end of the 30 s interval, assuming that the acceleration is const ant?