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10 menit = 600 s
Ek = 1/2 × m × v²
= 1/2 × 10 kg × ( 1.200 m : 600 s )² m/s
= 20 Joule
s= 1,2 km ---> 1,2×1000= 1200 m
t= 10 ----> 10×60= 600
m= 10 kg
Dit:
Ek=...?
Penye:
Ek= 1/2×m×v²
v= s/t
v= 1200/600
v= 2
Ek= 1/2×10×2²
Ek= 1/2×10×4
Ek= 20 J