3. A runner has constant acceleration for 6.4 seconds over a 20 m distance starting from rest. What is the acceleration of the runner?
a.
b. If it takes the runner 6.4 s to run the 20 m distance, what is the runner's final velocity?

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)