Calculate the escape velocity for a rocket fired from the earth's surface at a point where the acceleration due to gravity is 10ms^-2 and the radius of the earth is 6 x 10⁶m.

• A 7.8 x 10⁶ms^-12
• B 1.1 x 10⁴ms^-1
• C 3.5 x 10⁷ms^-1
• D 6.0 x 10⁷ ms^-1
• E 1.2 x 10⁸ms^2-1