Kinetic Energy Physics Example 1

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Example 1

easy
What is the kinetic energy of a 3 kg3 \text{ kg} ball moving at 8 m/s8 \text{ m/s}?

Solution

  1. 1
    Use the kinetic energy formula: KE=12mv2KE = \frac{1}{2}mv^2.
  2. 2
    Square the speed first: 82=648^2 = 64.
  3. 3
    KE=12(3)(64)=96 JKE = \frac{1}{2}(3)(64) = 96 \text{ J}

Answer

KE=96 JKE = 96 \text{ J}
Kinetic energy is the energy of motion. It depends on both mass and velocity, but velocity has a squared relationship, so doubling speed quadruples KE.

About Kinetic Energy

The energy an object possesses by virtue of its motion, equal to one-half times its mass times the square of its velocity.

Learn more about Kinetic Energy →

More Kinetic Energy Examples

Example 2 medium

A car doubles its speed from [formula] to [formula]. By what factor does its kinetic energy change?

Example 3 medium

A [formula] ball has [formula] of kinetic energy. What is its speed?

Example 4 easy

A [formula] car doubles its speed from [formula] to [formula]. By what factor does its kinetic energ

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