A 2 kg object is moving with a speed of 3 m/s. What is its kinetic energy?
Practice Questions
Q1
A 2 kg object is moving with a speed of 3 m/s. What is its kinetic energy?
6 J
9 J
12 J
18 J
Questions & Step-by-Step Solutions
A 2 kg object is moving with a speed of 3 m/s. What is its kinetic energy?
Correct Answer: 9 J
Step 1: Identify the mass (m) of the object. In this case, m = 2 kg.
Step 2: Identify the speed (v) of the object. Here, v = 3 m/s.
Step 3: Use the formula for kinetic energy: Kinetic energy = 0.5 × m × v².
Step 4: Substitute the values into the formula: Kinetic energy = 0.5 × 2 kg × (3 m/s)².
Step 5: Calculate (3 m/s)², which is 9 m²/s².
Step 6: Now multiply: 0.5 × 2 kg × 9 m²/s² = 9 J.
Step 7: The kinetic energy of the object is 9 Joules (J).
Kinetic Energy – Kinetic energy is the energy an object possesses due to its motion, calculated using the formula KE = 0.5 × m × v², where m is mass and v is velocity.
