Aline ball is sitting in the middle of the field. how can kinetic energy be given to that ball? a. lift it up and hold it b. lift it up with a string and hold it up c. kick it d. press down on it

On a mild saturday morning while people are working inside, the furnace keeps the temperature inside the building at 23degreesc. at noon the furnace is turned off, and the people go home. the temperature outside is a constant 16degreesc for the rest of the afternoon. if the time constant for the building is 3 hr, when will the temperature inside the building reach 18degreesc? if some windows are left open and the time constant drops to 2 hr, when will the temperature inside reach 18degreesc?