Which of the following would have the greatest force? 1. an object with low mass accelerating slowly 2. an object with low mass accelerating quickly 3. an object with high mass accelerating quickly 4. an object with high mass accelerating slowly

An object with high mass accelerating quickly. Assuming the objects have the same volume, the third choice will be the most dense, and therefore will take a longer time and a stronger opposite force to slow it down to a complete stop due to its high acceleration rate, as well.

Pretty good for a 13 year old, huh? : D