I don't know how to answer b on no.14Please help solve #15Thank you

14. Objects with masses of 200. kg and 500. kg are separated by 0.400 m. d a) Find the net gravitational force exerted by these objects on a 50.0-kg object placed midway between them. b) At what position (other than infinitely remote ones) can the 50.0-kg object be placed so as to experience a ne force of zero? Fret = GMIM2 _ GMZM3 - 6.67X10 x 200(50) _ 6-67x10 ( 50) (.50 0.400 : 0-200 m 2 (. 200 ) 2 (. 200 ) 2 - 2.50 x 10- N towards doject My 6. ) Fret = 0 15. A 600-kg satellite is in a circular orbit about Earth at a height above Earth equal to Earth's mean radius. a) Find the satellite's orbital speed. b) Find the gravitational force acting on it