Question

3. Suppose a car has 4000 J of kinetic energy. What will be its kinetic energy if the speed is doubled? What if the speed is tripled? ​

Answer 1

Answer:

Kinetic energy is calculated by

E = 0,5 × m × v^2

In other words, it varies as the square of your speed.

If the speed is doubled, the KE is quadrupled.

If the speed is tripled, KE increases to 9 times.

The correct word here is speed, not velocity. Velocity is a vector quantity, and requires a direction. Kinetic Energy does not care about the direction the object is moving, just its speed.

Answer 2

Explanation:

Kinetic energy is calculated by

E=0,5*m*v^2

In other words , it varies as the square of your speed

If the speed is doubled, the KE is quadrupled

If the speed is tripled , KE increases to 9 times