A van of mass 3200 kg with velocity +25 m/s collides head on with a sedan of mass 2000 kg with velocity -10 m/s. Calculate the velocity of the sedan after the collision. The van's speed was 0 m/s after the collision.? 10 m/s
20 m/s
30 m/s
40 m/s

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?