Dik: v:108km E:20.000joule Dit:m...?kg

Dik v = 108 km / jam
v = 108 × 1000 m / 1 ×3600 s
v = 30 m/s
E = 20.000 J
Dit m

Ek (energi kinetik) = 1/2 × m × v^2
20.000 = 1/2 × m × 30^2
20.000 = 1/2 × m × 900
20.000 = 450m
m = 20.000 / 450
m = 44 1/9 kg = 44.44 kg