A 4 kg object is moving with a velocity of 3 m/s. What is its kinetic energy?
Practice Questions
Q1
A 4 kg object is moving with a velocity of 3 m/s. What is its kinetic energy?
18 J
24 J
36 J
12 J
Questions & Step-by-Step Solutions
A 4 kg object is moving with a velocity of 3 m/s. What is its kinetic energy?
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 3 m/s.
Step 3: Write down the formula for kinetic energy (KE). The formula is KE = 0.5 * m * v².
Step 4: Substitute the mass into the formula. Replace m with 4 kg: KE = 0.5 * 4 kg * v².
Step 5: Substitute the velocity into the formula. Replace v with 3 m/s: KE = 0.5 * 4 kg * (3 m/s)².
Step 6: Calculate (3 m/s)². This equals 9 m²/s².
Step 7: Now substitute back into the formula: KE = 0.5 * 4 kg * 9 m²/s².
Step 8: Multiply 0.5 * 4 kg to get 2 kg.
Step 9: Now multiply 2 kg by 9 m²/s² to get 18 J.
Step 10: The kinetic energy of the object is 18 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.
