(a) The work done by the bird to raise the snake on the branch is equal to the product between the weight of the snake and the height of the branch above the ground:
where 
is the mass of the snake and 
is the height of the branch with respect to the ground. Substituting numbers into the equation, we find
(b) The work the bird did to raise its own centre of mass from the ground to the branch is equal to the product between the bird's weight and the height of the branch:
where 
is the mass of the bird. Substituting numbers into the equation, we find
Kinetic energy is your answer
By writing kinematic equations you can find the answer.
The acceleration is:
a = g
The speed is:
v = a * t
v = g * t
Note that as time passes, speed increases.
When increasing the speed, the resistance of the air is greater.
answer:
air resistance increases
The wording of the choices is really unclear. With two resistors in parallel,
here's the situation:
-- The voltage across each resistor is the same as the voltage across
the other one. If the parallel combination is connected to the battery,
then the voltage across each resistor is the full battery voltage.
-- The current through each resistor is (V) / (the resistance of that resistor).
That's the same current as would flow through that resistor if the other one
were not there.
-- As long as the battery or other power supply holds out, neither of these
quantities changes.
Can you match this situation to one of the choices listed ?
It looks to me as if choice 'C' is the one that's most likely
trying to say this.
