The escape speed from a very small asteroid is only 30 m/s. If you throw a rock away from the asteroid at a speed of 37 m/s, what will be its final speed?

Olympic skier tina maze skis down a steep slope that descends at an angle of 30∘ below the horizontal. the coefficient of sliding friction between her skis and the snow is 0.10. i found maze's acceleration which is 4.1 m/s^2. but how do you determine maze's speed 4.0 s after starting?