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A car of mass 1000 kg is moving with a speed of 20 m/s. What is its kinetic ener
A car of mass 1000 kg is moving with a speed of 20 m/s. What is its kinetic energy?
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Practice Questions
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Q1
A car of mass 1000 kg is moving with a speed of 20 m/s. What is its kinetic energy?
200,000 J
400,000 J
800,000 J
1,000,000 J
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Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 1000 kg × (20 m/s)² = 200,000 J.
Questions & Step-by-step Solutions
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Q
Q: A car of mass 1000 kg is moving with a speed of 20 m/s. What is its kinetic energy?
Solution:
Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 1000 kg × (20 m/s)² = 200,000 J.
Steps: 8
Show Steps
Step 1: Identify the mass of the car, which is 1000 kg.
Step 2: Identify the speed of the car, which is 20 m/s.
Step 3: Use the formula for kinetic energy: Kinetic Energy = 0.5 × mass × velocity².
Step 4: Substitute the mass and speed into the formula: Kinetic Energy = 0.5 × 1000 kg × (20 m/s)².
Step 5: Calculate (20 m/s)², which is 400 m²/s².
Step 6: Multiply 1000 kg by 400 m²/s² to get 400,000 kg·m²/s².
Step 7: Multiply 400,000 kg·m²/s² by 0.5 to get 200,000 J.
Step 8: Conclude that the kinetic energy of the car is 200,000 Joules.
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