tolong cara jelasnya ya...

8) vo = 72 km/jam = 20 m/s
vt = 0
s = 8 m

vt² = vo² - 2as
0 = 20² - 2.a.8
0 = 400 - 16a
16a = 400
a = 25 m/s²
Jadi perlambatannya 25 m/s²

9) vo = 5 m/s
t = 10 s
a = 10 m/s²

s = vo.t + ½at²
s = 5.10 + ½.10.10²
s = 50 + 500
s = 550 m