Answer
The escape speed from the planet is 60.0 km/s
Work Step by Step
Note that the gravitational field around at a planet's surface is: $\sqrt{\frac{GM_p}{R_p^2}}$
We can find the escape speed from the planet:
$v = \sqrt{\frac{2GM_p}{R_p}}$
$v = \sqrt{\frac{(GM_p)~(2R_p)}{R_p^2}}$
$v = \sqrt{(30.0~m/s^2)(2)(6.00\times 10^7~m)}$
$v = 6.00\times 10^4~m/s = 60.0~km/s$
The escape speed from the planet is 60.0 km/s.
