Picture #1: GPE = (mass) x (gravity) x (height) GPE = (2 kg) x (9.8 m/s²) x (40 m) = 784 joules
KE = (1/2) (mass) (speed²) KE = (1/2) (2 kg) (5 m/s)² KE = (1 kg) (25 m²/s²) = 25 joules
Picture #2: KE = (1/2) (mass) (speed²) KE = (1/2) (2 kg) (10 m/s)² KE = (1 kg) (100 m²/s²) = 100 joules
Picture #3: GPE = (mass) x (gravity) x (height) GPE = (20 kg) x (9.8 m/s²) x (2 m) = 392 joules
KE = (1/2) (mass) (speed²) KE = (1/2) (20 kg) (5 m/s)² KE = (10 kg) (25 m²/s²) = 250 joules Picture #4: GPE = (mass) x (gravity) x (height) 98 joules = (1 kg) x (9.8 m/s²) x (height) Height = (98 joules) / (1 kg x 9.8 m/s²) Height = 10 meters
Picture #5: GPE = (mass) x (gravity) x (height) 39,200 Joules = (mass) x (9.8 m/s²) x (20 m) Mass = (39,200 joules) / (9.8 m/s² x 20 m) Mass = 200 kg
