Hitung besar energi kinetik benda jika berat 185 N bergerak dengan kecepatan 45 km/jam.

w = 185 N

w = m × g

m = w ÷ g = 185 ÷ 10 = 18,5 kg

v = 45 km/jam

= 45 × 1.000 m ÷ 3.600 s

= 25/2 = 12,5 m/s

Ek = (1/2) × m × v^2

= (1/2) × 18,5 × 12,5 × 12,5

= 1.445,3125 J