f = m a ... a = f / m
a = (33 - 12) / (6 + 15)
a = (33 - 12) / (6 + 15)
Fnet = ma
where Fnet is the net force, m is the mass, and a is the acceleration.
In this case, we have the following forces acting on the sled and dog:
1. The force you exert pulling the sled and dog, which is 33N in the forward direction.
2. The frictional force opposing the motion, which is 12N in the opposite direction.
Since the sled and dog are considered as one system, we can calculate the net force acting on the system:
Fnet = Fapplied - Ffriction
= 33N - 12N
= 21N
The net force acting on the system is 21N.
Now, we can rearrange Newton's second law equation to find the acceleration:
a = Fnet / m
Given that the total mass of the sled and dog is 6kg + 15kg = 21kg, we can substitute the values into the equation:
a = 21N / 21kg
= 1 m/s^2
Therefore, the acceleration of the sled and dog is 1 m/s^2.