Question

a baseball with a mass of 0.15 kg is moving at a speed of 40.0 m/s. What is the baseball's kinetic energy from this motion?

Answer 1

The baseball's kinetic energy is 120 joules.

Step-by-step explanation:

The kinetic energy is defined as:

`k_(e) = (1)/(2)mv^(2)` (1)

Where
`k_(e)` is the kinetic energy, m is the mass and v is the velocity.

The kinetic energy represents how much energy have an object as a consequence of its movement.

For the case of a baseball (m = 0.15 kg, v = 40.0 m/s):

`k_(e) = (1)/(2)(0.15kg)(40.0m/s)^(2)`

`k_(e) = 120 Kg.m^(2)/s^(2)`

But 1 j =
`kg.m^(2)/s^(2)`

`k_(e) = 120 j`

Hence, baseball's kinetic energy is 120 joules.