Physics 15 pt
an object is placed in the gravitational field of a more massive object so that it is initially stationary. which statement best describes the velocity of the smaller object?
a. it's constant.
b. it increases with time.
c. it decreases with time.

Aswimming pool whose volume is 10 comma 000 gal contains water that is 0.01% chlorine. starting at tequals0, city water containing 0.003% chlorine is pumped into the pool at a rate of 5 gal/min. the pool water flows out at the same rate. what is the percentage of chlorine in the pool after 1 hour? when will the pool water be 0.006% chlorine?