I need help with this question. Thank you in advance.

Question

A planet of mass 7 × 10^24 kg is at location ‹ -4 × 10^11, 8 × 10^11, 0 › m. A star of mass 9 × 10^30 kg is at location ‹ 7 ×10^11, -6 × 10^11, 0 › m. What is the force exerted on the planet by the star? I approached the problem and I got an answer. I believe my answer is wrong but I tried the gravitational force equation, the difference of the sun and planet, the equation for magnitude, and the equation for the unit vector. I need help. Thanks in advance.

Answer 1

You have the mass of the two objects. 

Determine the distance between them.

The both lie in the x-y plane (z = 0)

They are at (-4, 10) and (7, -6)

d = √(-13² + 16²)

Then substitute masses and distance into gravitation force equation.