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What is the kinetic energy of a 3 kg object moving at a speed of 4 m/s? (2022)
What is the kinetic energy of a 3 kg object moving at a speed of 4 m/s? (2022)
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Practice Questions
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Q1
What is the kinetic energy of a 3 kg object moving at a speed of 4 m/s? (2022)
24 J
12 J
6 J
48 J
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Kinetic Energy (KE) = 0.5 × m × v² = 0.5 × 3 kg × (4 m/s)² = 24 J.
Questions & Step-by-step Solutions
1 item
Q
Q: What is the kinetic energy of a 3 kg object moving at a speed of 4 m/s? (2022)
Solution:
Kinetic Energy (KE) = 0.5 × m × v² = 0.5 × 3 kg × (4 m/s)² = 24 J.
Steps: 9
Show Steps
Step 1: Identify the mass of the object. In this case, the mass (m) is 3 kg.
Step 2: Identify the speed of the object. Here, the speed (v) is 4 m/s.
Step 3: Write down the formula for kinetic energy (KE). The formula is KE = 0.5 × m × v².
Step 4: Substitute the mass and speed into the formula. This gives us KE = 0.5 × 3 kg × (4 m/s)².
Step 5: Calculate (4 m/s)². This equals 16 m²/s².
Step 6: Now substitute this value back into the equation: KE = 0.5 × 3 kg × 16 m²/s².
Step 7: Multiply 0.5 by 3 kg to get 1.5 kg.
Step 8: Now multiply 1.5 kg by 16 m²/s² to get 24 kg·m²/s², which is equal to 24 J (Joules).
Step 9: Therefore, the kinetic energy of the object is 24 J.
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