# A kangaroo hops 1 km. How does its speed affect

A kangaroo hops 1 km. How does its speed affect the total energy needed to cover this distance?
A. A faster speed requires less total energy.
B. A faster speed requires more total energy.
C. The total energy is about the same for a fast speed and a slow speed.
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temzej9

Step 1
From the graph the slope for both the lines is a constant.
Given that a kangaroo hops 1 km, the amount of oxygen taken is directly proportional to the energy expenditure. Since the slope does not change with speed for kangaroo, the total energy needed to move a specific distance is same at any speed.
In conclussion. the total energy is about the same for a fast speed and a slow speed $⇒C$

Laura Worden
Step 1
$\text{Power}=\frac{\text{Energy}}{\text{Time}}$
To speed up. A kangaroo needs less power in addition to original power.
When kangaroo hops fast, the change in power is very small when compared with original power. Power is direct proportion with amount of energy consumed. So small change in power doesnt

nick1337

Step 1
As per the law of conservation of energy, energy can be destroyed nor be created. It can only transform from one form to another.
Work done is always equal to product of force and displacement.
$W=Fd$
Where, $F=\text{force}$
$d=\text{the displasement}$
From above work done does not depend on speed.
Step 2
Therefore, option (a), and (b) are incorrect.
Hence, correct option is (c)