An unstable particle is at rest and suddenly decays into two fragments. no external forces act on the particle or its fragments. one of the fragments has a speed of 0.56c and a mass of 6.68×10−27kg, while the other has a mass of 1.67×10−27kg.

what is the speed of the less massive fragment?

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?