Question

The kinetic energy of a baseball that with a mass of 0.140kg is 7 J. What is the baseballs velocity?

Answer 1

10 m/s

Step-by-step explanation:

Kinetic energy=
`(1)/(2)`mv² where m is mass and v is velocity.

We have to make v the subject so we should rearrange the equation

K=
`(1)/(2)`mv²

v²=
`(K)/(0.5*m)` (use algebra)

v²= 7/0.5×0.140

v²=100

v=√100

v=10 m/s

We can confirm this by using the kinetic energy formula.

K=
`(1)/(2)`×0.140×10²

K= 7 J

Hence it is proved that velocity is 10 m/s