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Which of the following statements about gravitational fields is true?
The strength of a gravitational field is proportional to the product of the two masses which are interacting.
The strength of a gravitational field produced by an object varies inversely with the distance from the object’s center of mass.
The acceleration of an object due to a gravitational field is equal to the strength of the field at that object's location.
Gravitational fields can be both attractive and repulsive.