Final answer:
The mass of your little sister cannot be determined based solely on the sled's mass of 8.0 kg.
Step-by-step explanation:
Determining the mass of your sister requires additional information or an equation that relates her mass to the sled's mass. The question seems to imply a scenario involving a sled being pulled or pushed, where the mass of the sister might be linked to the sled's mass in some way, like through a force equation or a given relationship. However, without that direct information or a specific equation connecting their masses, it's impossible to calculate the sister's mass using just the sled's mass.
In physics, when objects are interconnected or interact in some way, the equations governing their relationship often involve forces, accelerations, or other physical properties. These equations allow for the determination of one object's mass when given information about another, such as in systems where forces are balanced or where acceleration is constant. However, in this scenario, the lack of a connecting equation or further context prevents a direct calculation of the sister's mass from the sled's mass alone. Therefore, without additional information, the sister's mass cannot be accurately determined solely based on the given sled mass.