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Perubaha Kecepatan = 30-10 = 20 m/s
W = F. S
W(usaha) = EK ( Energi Kinetik)
Karena S tidak diketahui gunakan Persamaan EK Karena Bergerak (Horizontal) akan tetapi jika keatas (Vertikal) gunakan rumus EP(Energi Potensial).
EK = ¹/₂ m v²
EK = ¹/₂ (150) (20²)
EK = ¹/₂ (150) (400)
EK = ¹/₂ (6 x 10⁴)
EK= 3x10⁴ Joule = 30000 Joule = 30 kJ (Kilo Joule)
W=1/2.m.(Vt²-Vo²)
W=1/2.(50+100)(30²-10²)
W=1/2.150.(900-100)
W=75.800
W=60.000 J
W=60 kJ