If a car accelerates from rest to a speed of 20 m/s, and its mass is 1000 kg, wh

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Question: If a car accelerates from rest to a speed of 20 m/s, and its mass is 1000 kg, what is the kinetic energy of the car at that speed? (2020)

Options:

200 J
1000 J
2000 J
4000 J

Correct Answer: 2000 J

Exam Year: 2020

Solution:

Kinetic Energy = 0.5 × mass × velocity² = 0.5 × 1000 kg × (20 m/s)² = 200000 J = 2000 J

If a car accelerates from rest to a speed of 20 m/s, and its mass is 1000 kg, wh

Practice Questions

If a car accelerates from rest to a speed of 20 m/s, and its mass is 1000 kg, what is the kinetic energy of the car at that speed? (2020)

200 J
1000 J
2000 J
4000 J

Questions & Step-by-Step Solutions

If a car accelerates from rest to a speed of 20 m/s, and its mass is 1000 kg, what is the kinetic energy of the car at that speed? (2020)

Step 1: Identify the formula for kinetic energy, which is Kinetic Energy = 0.5 × mass × velocity².
Step 2: Write down the mass of the car, which is 1000 kg.
Step 3: Write down the final speed of the car, which is 20 m/s.
Step 4: Substitute the values 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 400000 kg·m²/s².
Step 7: Multiply 400000 kg·m²/s² by 0.5 to get 200000 J.
Step 8: Conclude that the kinetic energy of the car at 20 m/s is 200000 J.

Kinetic Energy – Kinetic energy is the energy an object possesses due to its motion, calculated using the formula KE = 0.5 × mass × velocity².

If a car accelerates from rest to a speed of 20 m/s, and its mass is 1000 kg, wh

What’s inside this PDF?

If a car accelerates from rest to a speed of 20 m/s, and its mass is 1000 kg, wh

Practice Questions

Questions & Step-by-Step Solutions

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