A car of mass 1000 kg is moving at a speed of 20 m/s. What is its kinetic energy
Practice Questions
Q1
A car of mass 1000 kg is moving at a speed of 20 m/s. What is its kinetic energy?
200 J
400 J
200,000 J
400,000 J
Questions & Step-by-Step Solutions
A car of mass 1000 kg is moving at a speed of 20 m/s. What is its kinetic energy?
Step 1: Identify the mass of the car. The mass (m) is given as 1000 kg.
Step 2: Identify the speed of the car. The speed (v) is given as 20 m/s.
Step 3: Write down the formula for kinetic energy (KE). The formula is KE = 0.5 * m * v².
Step 4: Substitute the values into the formula. Replace m with 1000 kg and v with 20 m/s: KE = 0.5 * 1000 * (20)².
Step 5: Calculate (20)². This equals 400.
Step 6: Multiply 1000 kg by 400. This equals 400,000.
Step 7: Multiply 400,000 by 0.5. This equals 200,000.
Step 8: Conclude that the kinetic energy of the car is 200,000 Joules (J).
Kinetic Energy – Kinetic energy is the energy possessed by an object due to its motion, calculated using the formula KE = 0.5mv², where m is mass and v is velocity.
