A 1000-kg car moving north at 30 mph (13.4 m/s) collides with a 2000-kg SUV moving east at 50 mph (22.4 m/s). The cars get
entangled and move off together. What is their final velocity (speed
and direction)?

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297