If tennis ball is thrown vertically with my hand to highest point with initial velocity 30m/s in a time of 3s. The ball takes 3s to move downwards. The question arises in my mind is that, Is tennis ball follow Newton's third law of motion?

Air conditioners not only cool air, but dry it as well. suppose that a room in a home measures 5.0m×9.0m×2.4m . if the outdoor temperature is 30 ∘c and the vapor pressure of water in the air is 85 % of the vapor pressure of water at this temperature, what mass of water must be removed from the air each time the volume of air in the room is cycled through the air conditioner? the vapor pressure for water at 30 ∘c is 31.8 torr.