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A 4 kg object is moving with a speed of 5 m/s. What is its kinetic energy?
A 4 kg object is moving with a speed of 5 m/s. What is its kinetic energy?
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Q1
A 4 kg object is moving with a speed of 5 m/s. What is its kinetic energy?
10 J
20 J
50 J
100 J
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Kinetic energy = 0.5 × m × v² = 0.5 × 4 kg × (5 m/s)² = 50 J.
Questions & Step-by-step Solutions
1 item
Q
Q: A 4 kg object is moving with a speed of 5 m/s. What is its kinetic energy?
Solution:
Kinetic energy = 0.5 × m × v² = 0.5 × 4 kg × (5 m/s)² = 50 J.
Steps: 8
Show Steps
Step 1: Identify the mass (m) of the object. In this case, m = 4 kg.
Step 2: Identify the speed (v) of the object. Here, v = 5 m/s.
Step 3: Use the formula for kinetic energy: Kinetic energy = 0.5 × m × v².
Step 4: Substitute the values into the formula: Kinetic energy = 0.5 × 4 kg × (5 m/s)².
Step 5: Calculate (5 m/s)², which is 25 m²/s².
Step 6: Multiply 4 kg by 25 m²/s² to get 100 kg·m²/s².
Step 7: Multiply 100 kg·m²/s² by 0.5 to get 50 J.
Step 8: Conclude that the kinetic energy of the object is 50 Joules.
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