A 4 kg object is moving with a velocity of 5 m/s. What is its kinetic energy? (2
Practice Questions
Q1
A 4 kg object is moving with a velocity of 5 m/s. What is its kinetic energy? (2021)
10 J
20 J
50 J
100 J
Questions & Step-by-Step Solutions
A 4 kg object is moving with a velocity of 5 m/s. What is its kinetic energy? (2021)
Step 1: Identify the mass of the object. The mass (m) is given as 4 kg.
Step 2: Identify the velocity of the object. The velocity (v) is given as 5 m/s.
Step 3: Write down the formula for kinetic energy (KE). The formula is KE = 1/2 * m * v².
Step 4: Substitute the mass and velocity into the formula. This gives KE = 1/2 * 4 kg * (5 m/s)².
Step 5: Calculate the square of the velocity. (5 m/s)² = 25 m²/s².
Step 6: Multiply the mass by the squared velocity. 4 kg * 25 m²/s² = 100 kg*m²/s².
Step 7: Multiply by 1/2. 1/2 * 100 kg*m²/s² = 50 J.
Step 8: State the final answer. The kinetic energy is 50 Joules (J).
Kinetic Energy – Kinetic energy is the energy an object possesses due to its motion, calculated using the formula KE = 1/2 mv², where m is mass and v is velocity.
