The answer to your question is "20kgx9.8m/s" because weight is the force an object is exerting on another object, and the formula used to calculate force is <em>Force = Mass * Acceleration</em>.
I think the right answer would be objects pull because gravitational pull is when an object with more mass than an other object would pull the small mass object
Answer: Its The Force Of Gravity
I hope this helps :)