Average speed = (total distance covered) / (time to cover the distance)
Total distance = 69 km + 51 km = 120 km
Total time = 3 hrs + 2 hrs = 5 hrs
Average speed = (120 km) / (5 hrs) = 24 km/hr
Answer:
Part a)

Part b)

Part c)

Explanation:
Part a)
As we know that the gravitational force is given as

so we will have to find the ratio of force on two planets due to star
so here we have



Part b)
Orbital speed is given as

so the ratio of two orbital speed is given as


Part c)
Time period is given as

so the ratio of two time period is given as



The masses of the children may not be taken into account since these are towards the ground and directly affecting the bear. The net force is the difference of the forces since they are acting on opposite sides. The magnitude of this net force is equal to 2N and the sign is to where the greater force is from. Therefore, the force is directed towards the left.
I say a subsidy because the government is controlling how many cows they have.