1 sampai 5 ya plis jawab

nomor 1
72 km/jam dijadikan m/s
72 km = 72000 m
1 jam = 3600 s
jadi 72000:3600 = 20 m/s

nomor 2
v = 70 km/jam
t = 1/2 jam
s = vxt = 70x(1/2) = 35 km

nomor 3
v = 50 km/jam
s = 20 km
t = s:v = 20:50 = 0.4 jam

nomor 4
s = 120 km
t = 06.00 sampai 09.00 = 3 jam
v = s : t = 120 : 3 = 40 km/jam

nomor 5
1,2 km/jam dijadikan meter/menit
1.2 km = 1200 meter
1 jam = 60 menit
jadi v = 1,2 km/jam = 1200:60 = 20 meter/menit
s = 240 meter
t = s:v = 240 : 20 = 12 menit