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If a 4 kg object is moving with a speed of 5 m/s, what is its kinetic energy?
If a 4 kg object is moving with a speed of 5 m/s, what is its kinetic energy?
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Practice Questions
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Q1
If a 4 kg object is moving with a speed of 5 m/s, what is its kinetic energy?
50 J
40 J
100 J
80 J
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Kinetic Energy (KE) = 0.5 × m × v² = 0.5 × 4 kg × (5 m/s)² = 0.5 × 4 × 25 = 50 J.
Questions & Step-by-step Solutions
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Q
Q: If a 4 kg object is moving with a speed of 5 m/s, what is its kinetic energy?
Solution:
Kinetic Energy (KE) = 0.5 × m × v² = 0.5 × 4 kg × (5 m/s)² = 0.5 × 4 × 25 = 50 J.
Steps: 7
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: KE = 0.5 × m × v².
Step 4: Calculate v² (the speed squared). v² = (5 m/s) × (5 m/s) = 25 m²/s².
Step 5: Substitute the values into the formula: KE = 0.5 × 4 kg × 25 m²/s².
Step 6: Calculate 0.5 × 4 = 2.
Step 7: Multiply 2 by 25 to get KE: 2 × 25 = 50 J.
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