Question

An object has a kinetic energy of 90 J and a mass of 30 kg how fast is the object moving?

Answer 1

The speed of the object will be "2.4 m/s".

Step-by-step explanation:

The given values are:

Kinetic energy,

K.E = 90 J

Mass,

m = 30 kg

Speed,

v = ?

As we know,

⇒
`K.E=(1)/(2) (mass* speed^2)`

On substituting the values, we get

⇒
`90=(1)/(2) (30* v^2)`

⇒
`90=15* v^2`

⇒
`v^2=(90)/(15)`

⇒
`v^2=6`

⇒
`v=√(6)`

⇒
`v=2.44 \ m/s`