A rightward force is applied to a 6 kg object to move it across a rough surface at constant velocity. The object encounters 15 N of frictional force. Draw a system schema and FBD for this situation and then determine all forces from your FBD. Please, I honestly don’t understand!

If water vapor with the mass of 35.0 grams is cooled and condensed into water in a closed system such as a closed glass jar, what is the mass of the water after the water vapor completely condenses? a) 34.5 grams b) 35.0 grams c) 35.5 grams d) the mass cannot be determined without knowing the volume