It takes a force of 20 N to lift a mass of 4 kg off the surface of a planet. The value of the acceleration due to gravity is: O 0.2 m /s 2. 0 5 m/s ? O 20 m /s ? 80 m/s 2 . Question 4 (Mandatory) (1 point) Likes repel and unlikes attract. This general rule works for all types of fields except: O Gravitational. O Electrical. O Magnetic. O Electromagnetic