Answer:
Gravitational potential energy, PE = 2.8 J
Step-by-step explanation:
It is given that,
Mass of the bluebird, m = 34 g = 0.034 kg
It flies from the ground to the top of an 8.5-m tree, h = 8.5 m
We need to find the change in the bluebird's gravitational potential energy as it flies to the top of the tree. It can be calculated as :


PE = 2.83 J
or
PE = 2.8 J
So, the gravitational potential energy as it flies to the top of the tree is 2.8 J. Hence, this is the required solution.