3. A ball is thrown upward with an initial velocity of 4 m/s. The ball's velocity after 8 seconds is ___ m/s.
(g=-9.8m/s2)

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

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?

What ia the energy of an object because of its potential and kinetic energies