The escape velocity at the surface of the

Earth is approximately $8k\frac{m}{s}.$ What is the

escape velocity for a planet whose radius is $4$

times larger than Earth's, and whose mass is

$64$ times that of Earth's?

$256k\frac{m}{s}$

$8k\frac{m}{s}$

$16k\frac{m}{s}$

$32k\frac{m}{s}$

$128k\frac{m}{s}$