Bantu jawab nomor 8,9,10

8. s = vot + 1/2.a.t
180 = 8.10 + 1/2.a.10
180 = 80 + 5a
180-80 = 5a
5a = 100
a = 100/5
a = 20 m/s

9. (a), (c) dan (d)