Why doesnt Kanna from dragon maid have any expression most of the time
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What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

Can anybody me with this? ? (picture included.)

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?