Give me steps

20.  A small plane with a mass of 1200 kg cruises at 140 km h ^$-$1 at an altitude of 1.5 km. Taking g = 10 m
s ^$-$2 , calculate its:
(a) potential energy and                                            [Ans. 1.8 $\times$ 10⁷ J]
(b) kinetic energy                                                      [Ans. 9.074 $\times$ 10⁵ J]