Calculate the height of an object that hit the ground in 9 seconds in free fall (vi=0) (customary units).

Plss anybody know how to do this? ? i need the answers from a through d

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Agas is contained in a vertical, frictionless piston–cylinder device. the piston has a mass of 3.2 kg and a cross-sectional area of 35 cm2. a compressed spring above the piston exerts a force of 190 n on the piston. if the atmospheric pressure is 95 kpa, determine the pressure inside the cylinder.