At a Distance of 14,000 Km from the Center of Planet

Multiple Choice

At a distance of 14,000 km from the center of Planet Z-99,the free-fall acceleration is 32 m/s².What is the free-fall acceleration at a point 28,000 km from the center of this planet?

A) 8.0 m/s²
B) 16 m/s²
C) 128 m/s²
D) 4.0 m/s²
E) 2.0 m/s²