Question

A 4.0 kg bird has 8.0 joules of kinetic energy how fast is it flying

Answer 1

The velocity of the bird is 2 m /sec .

Step-by-step explanation:

The formula for kinetic energy is given by.

`Kinetic\ energy = (1)/(2)\ m\ v^(2)`

Where m is mass , v is the velocity .

As given

A 4.0 kg bird has 8.0 joules of kinetic energy .

m = 4.0 kg

K.E = 8.0 joules

Putting in the formula

`8.0 = (1)/(2)* 4.0* v^(2)`

`v^(2)= (8.0* 2)/(4.0)`

`v^(2)= 2* 2`

`v^(2)= 4`

`√(4) = 2`

Thus

v = 2 m/sec

Therefore the velocity of the bird is 2 m /sec .