Arocket is launched vertically upward with a speed v,. take the upward direction as positive and let the mass be m. assume that the only force acting on the rocket is gravity, which is inversely proportional to the square of the distance from the center of the earth. let y(t) be the distance from the center of the earth at time, t. the correct differential equation for the position of the rocket is select the correct answer dy a -kly dy di e none of the above 17. in the previous problem, the solution for the velocity, v, is select the correct answer. evc+2k/(my) e. none of the above 18. in the previous problem, if y(0) -r the escape velocity is select the correct answer e none of the above