9m Close to a planet's surface the weight force of an object can be expressed as F = mg N, where g is the acceleration due to gravity in HIS2 and m is the mass ofthe object in kg, Let x stand forthe height of the object above the surface of the planet. Part 1) Write an integral expression for the work done by the gravitational force on an object with mass m as it is moved from x = a to x = b where b > a. W = ffoCde where i4 II II X2 where C is a constant, greater than zero. Part 2) Solve this integral to give an expression for the amount of work done by the gravitational force. W 2 J Part 3) If the satellite is released from rest at I), what speed will it have when it returns to the point a? 1): m/s