Answer
The velocity of the bird is 2 m /sec .
Explanation:
The formula for kinetic energy is given by.
\(Kinetic\ energy = \frac{1}{2}\ m\ v^{2}\)
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
\(8.0 = \frac{1}{2}\times 4.0\times v^{2}\)
\(v^{2}= \frac{8.0\times 2}{4.0}\)
\(v^{2}= 2\times 2\)
\(v^{2}= 4\)
\(\sqrt{4} = 2\)
Thus
v = 2 m/sec
Therefore the velocity of the bird is 2 m /sec .
