Answer
The velocity of the bird is 2 m /sec .
Explanation:
The formula for kinetic energy is given by.

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





Thus
v = 2 m/sec
Therefore the velocity of the bird is 2 m /sec .
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