**Kinetic Energy Formula and Example Problems – **In physics, an object will move if it is given kinetic energy or potential energy. One type of energy according to physics is kinetic energy. This type of energy has a different formula and pattern from other energies. So what is kinetic energy? This time I will discuss the complete kinetic energy formula with a pattern of kinetic energy problems. You can immediately see below.

## Kinetic Energy Formula and Example Problems

The definition of kinetic energy is the energy contained in any object to carry out motion. However, a stationary object has no kinetic energy. An object is said to have kinetic energy if it has a certain velocity and mass. The velocity of an object is the constant velocity of the object or the average velocity of the object. Below is the kinetic energy formula along with the kinetic energy problem pattern.

### Kinetic Energy Formula

Like potential energy, kinetic energy also has its own formula. Following **kinetic energy formula**his:

Ek = xmx v²

Information:

Ek = Kinetic energy (Joule)

m = Mass (kg)

v = Speed (m/s)

Based on the kinetic energy formula above, we can conclude that the faster the object’s motion, the greater the kinetic energy of the object. Then if the object has a greater mass, then the kinetic energy of the object also increases.

From the expression of the kinetic energy formula, we can observe several patterns of kinetic energy in everyday life:

- Budi drives a car with a constant speed of 50 km/hour.
- A ball is rolled on the ground with a speed of 4 m/s.
- Pak Adi pulls his cart at a speed of 1.5 m/s.

The essence of kinetic energy in an object is when the object has a certain speed and mass.

**Also read: Types of Lunar Eclipses and their Occurrence**

### Examples of Kinetic Energy Problems

Below are some patterns of kinetic energy questions that I present to you. Here’s the problem pattern:

1. Ridwan pedals his bicycle at a speed of 2.5 m/s. If Ridwan’s bicycle has a mass of 10 kg. Calculate the kinetic energy!

Discussion.

Given: v = 2.5 m/s; m = 10 kg

Asked: Ek = ?

Answer:

Ek = xmx v²

= x 10 x 2.5²

= 31.25 Joule

2. Pak Darto drives a car with a speed of 4 m/s. Pak Darto’s car has a mass of 1 ton. Calculate the kinetic energy!

Discussion.

Given: v = 4 m/s; m = 1 ton = 1000 kg

Asked: Ek = ?

Answer:

Ek = xmx v²

= x 1000 x 4²

= 8,000 Joule

3. A child is doing a shot put and rolling the ball onto the ceramic. If the kinetic energy of the ball is 90 Joules and its mass is 5 kg. What is the speed of the ball?

Discussion.

Given: Ek = 90 J; m = 5 kg

Asked: v = ?

Answer:

Ek = xmx v²

90 = x 5 x v²

90 = 2.5v²

v² = 90/2.5

v² = 36

v = 36

v = 6 m/s

4. A water drum is rolling at a speed of 5 m/s. If the drum has a kinetic energy of 250 Joules. What is the mass of the drum?

Discussion.

Given: Ek = 250 J; v = 5 kg

Asked: m = ?

Answer:

Ek = xmx v²

250 = xmx 5²

250 = xmx 25

m = 250 x 2: 25

m = 20 kg

5. Two balls have the same mass. If ball A has a speed of 2 m/s and ball B has a speed of 3 m/s. Calculate the ratio of the kinetic energy of ball A to ball B!

Discussion.

Given: mA = mB; vA = 2 m/s; vB = 3 m/s

Wanted : Ek A : Ek B = ?

Answer:

Ek A : Ek B

x mA x vA² : x mB x vB²

x mA x 2² : x mB x 3²

4 mA : 9 mB

Since the masses of ball A and ball B are the same, the ratio of kinetic energy between ball A and ball B is 4: 9.

Thus the clarification of the kinetic energy formula along with the pattern of kinetic energy problems. Hopefully this article can be useful. Thank you.