Escape Velocity Physics?

(a) What is the escape speed on a spherical asteroid whose radius is 540 km and whose gravitational acceleration at the surface is 2.6 m/s2?

Ve = √(2 R g)

i found that to be 1680 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?

used const. acc. equation

Vf^2-Vo^2 = 2 * a * x

-(1000m/s)^2 = 2 * (-2.6m/s^2) * x

x= 192000 m

^^^getting a wrong answer

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

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