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Verified answer
1.v : 20m/st: 5s
a?
a= v/t
20/ 5=4
2.v : 72km/jam = 20m/s
t: 30 menit = 1800s
s?
s=v.t
20 . 1800= 36000
3. V0= 18 km/jam = 0,5m/s
a= 5 m/s^2
t = 5 s
vt?
a= vt- v0 /t
5= vt - 0,5 / 5
25 =vt-0,5
25,5 = vt
jadi kecepatan akhirnya adalah 25,5 m/s