Answer:
1. 250 J
2. 500000 J
3. 146250 J
4. 400 J
Explanation:
1. Determination of the energy of the ball.
Mass (m) = 5 Kg
Velocity (v) = 10 m/s
Energy (E) =?
E = ½mv²
E = ½ × 5 × 10²
E = 2.5 × 100
E = 250 J
2. Determination of the energy of the rock.
Mass (m) = 250 Kg
Height (h) = 200 m
Acceleration due to gravity (g) = 10 m/s²
Energy (E) =?
E = mgh
E = 250 × 10 × 200
E = 500000 J
3. Determination of the energy of the car.
Mass (m) = 1300 Kg
Velocity (v) = 15 m/s
Energy (E) =?
E = ½mv²
E = ½ × 1300 × 15²
E = 650 × 225
E = 146250 J
4. Determination of the energy of the bullet.
Mass (m) = 0.005 Kg
Velocity (v) = 400 m/s
Energy (E) =?
E = ½mv²
E = ½ × 0.005 × 400²
E = 0.0025 × 160000
E = 400 J
