What is the escape speed on a spherical asteroid whose

Question

(a) What is the escape speed on a spherical asteroid whose radius is 500 km and whose gravitational acceleration at the surface is 2.7 m/s2?

m/s

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

m

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

m/s