What is the kinetic energy of a 4 kg object moving at a speed of 2 m/s?

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Question: What is the kinetic energy of a 4 kg object moving at a speed of 2 m/s?

Options:

Correct Answer: 8 J

Solution:

Kinetic energy is calculated as KE = 0.5 × m × v², so KE = 0.5 × 4 kg × (2 m/s)² = 8 J.

What is the kinetic energy of a 4 kg object moving at a speed of 2 m/s?

What is the kinetic energy of a 4 kg object moving at a speed of 2 m/s?

Step 1: Identify the mass of the object. In this case, the mass (m) is 4 kg.
Step 2: Identify the speed of the object. Here, the speed (v) is 2 m/s.
Step 3: Write down the formula for kinetic energy: KE = 0.5 × m × v².
Step 4: Substitute the mass and speed into the formula: KE = 0.5 × 4 kg × (2 m/s)².
Step 5: Calculate (2 m/s)², which is 4 m²/s².
Step 6: Now substitute this value back into the equation: KE = 0.5 × 4 kg × 4 m²/s².
Step 7: Multiply 0.5 × 4 kg to get 2 kg.
Step 8: Now multiply 2 kg by 4 m²/s² to get 8 kg·m²/s², which is equal to 8 Joules (J).
Step 9: Therefore, the kinetic energy of the object is 8 J.

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