Tolong isi yg nomor 8,pake jalan y. Please

Diket:
t = 2 s
V1 = 72 km/jam = 20 m/s
V2 = 90 km/jam = 25 m/s
Dit: a....?
a = V2 - V1/t
a = 25-20/2
a = 5/2
a = 2,5 m/s²