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Verified answer
1). 22/7 x 14 = 44 : 2 = 2220 cm = 0,2
22+0,2+22+0,2=44,4
44.4 x 10 = 444 m jarak yang dilalui teo.
20x60= 1200 sekon
v=s/t
=444 : 1200 = 0,37 m/s
K = (phi × d) + (2 × 20)
K = (22/7 × 14) + 40
K = 44 + 40
K = 84 m
Kelajuan = s/t
Kelajuan = (10 × 84) m/(20 × 60) s
Kelajuan = 840 m/1200 s
Kelajuan = 0,7 m/s
Jadi kelajuan rata-rata lari Teo adalah 0,7 m/s
catatan : gambar salah 20 cm tapi 20 m
2.
s = v × t
s = 90 km/jam × 30 menit
s = 90 km/jam × 30/60 jam
s = 90 km/jam × 0,5 jam
s = 45 km
Jadi panjang lintasan rel yang ditempuh kereta api Prameks adalah 45 km