How many forces are acting on a box that is being pushed across the floor

In the image, the arrow is pointing to a celestial object. which attribute disqualifies the object from being a planet?

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

Asuppose a suitcase has a mass of (m) 30 kg and a net force (n) of 10 kg*m/s. what is the acceleration rate of the suitcasein m/s? show your work to support your answer.