A 75 kg astronaut, motionless in space, throws a 0.40 kg wrench. The wrench leaves the astronaut’s hand at 25 m/s. What is the speed at which the astronaut travels backwards?

If state law mandates that elevators cannot accelerate more than 2.40 m/s2 or travel faster than 14.8 m/s , what is the minimum time in which an elevator can travel the 373 m from the ground floor to the observatory floor? ?