How far from the surface will a particle go if it leaves

Question

(a) What is the escape speed on a sphericalasteroid whose radius is 570 km and whose gravitationalacceleration at the surface is 3.3 m/s2?

--------- m/s

(b) How far from the surface will a particle go if it leaves theasteroid's surface with a radial speed of 1000 m/s?

----------m

(c) With what speed will an object hit the asteroid if it isdropped from 1000 km above the surface?

----------m/s