1. The problem statement, all variables and given/known data A non-rotating spherical planet has mass M and radius R. A particle is fired off from the surface with a speed equal to 3/4 the escape speed. Calculate the farthest distance it reaches (measured from the center of the planet) if it is fired off tangentially. 2. Relevant equations GPE = G*M*m*((1/R) - (1/d)) KE = ½*m*Ve² 3. The attempt at a solution I did this problem correctly when the problem stated that the particle is fired off radially (d=R*(16/7)), but I don't know what changes when the particle is fired tangentially.