A truck of mass 1000kg increases its speed from 36 km/h to 72 km/h.
find the increase in its Kinetic energy
Answers
Answer:
The increase in kinetic energy of the truck is 1,50,000 J.
Explanation:
The magnitude of speed and velocity are the same. So the magnitude of speed can be also used as the velocity for calculations.
The mass of the truck, m = 1000 Kg
Initial velocity of the truck, v₁ = 36 Km/hr = 10 m/s
Final velocity of the truck, v₂ = 72 Km/hr = 20 m/s
The initial kinetic energy of the truck, K.E₁ = (mv₁²) / 2
= (1000 × 10²) / 2
= 50,000 J
The final kinetic energy of the truck, K.E₂ = (mv₂²) / 2
= (1000 × 20²) / 2
= 2,00,000 J
∴ Increase in kinetic energy, K.E = K.E₂ - K.E₁
= 2,00,000 - 50,000
= 1,50,000 J