Answer:
The velocity of the bird is 2 m /sec.
Step-by-step explanation:
The formula for kinetic energy is given.
Where m is mass, and 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.