Topic 4: Kinetic Energy – Formula & Numericals

Q1. Kinetic energy of a body depends on:
A) Mass only
B) Velocity only
C) Mass and velocity
D) Acceleration

Answer: C


Q2. Formula for kinetic energy is:
A) m v
B) m v²
C) (1/2) m v²
D) m g h

Answer: C


Q3. SI unit of kinetic energy is:
A) Newton
B) Joule
C) Watt
D) Pascal

Answer: B


Q4. If velocity of a body becomes double, its kinetic energy becomes:
A) Double
B) Three times
C) Four times
D) Eight times

Answer: C


Q5. A body of mass 2 kg moves with velocity 3 m/s.
Find its kinetic energy.
A) 3 J
B) 6 J
C) 9 J
D) 18 J

Answer: C


Q6. A body of mass 1 kg is at rest.
Its kinetic energy is:
A) 1 J
B) 0.5 J
C) Zero
D) Maximum

Answer: C


Q7. Which has more kinetic energy?
A) Slow moving heavy truck
B) Fast moving light car
C) Body at rest
D) Stationary object

Answer: B


Q8. Kinetic energy is proportional to:
A) Velocity
B) Square of velocity
C) Square of mass
D) Height

Answer: B

Chapter 3: Work, Energy & Power

Topic 4: Kinetic Energy – Quick Revision

1. Definition

Kinetic energy is the energy possessed by a body due to its motion.

2. Formula

KE = (1/2) m v²

3. SI Unit

Joule (J)

4. Dependence

• Directly proportional to mass
• Proportional to square of velocity

5. Important Results

• Velocity doubled → KE becomes four times
• At rest → KE = 0

Exam Focus (MHT-CET)

Numericals are frequently asked using KE formula. Watch units and square of velocity carefully.