Respuesta :
According to Newton 's first law of motion, which states that an object in motion will keep on moving unless an external balance is applied to it. The solution is the last option, the marble will continue to roll along the hardwood floor at the same speed in the same direction for 20 more seconds.
A force applied by the hardwood floor will oppose the motion of the marble, causing the marble to slow to a stop.
This is the correct answer. gravity will cause it to slow down as well as the friction of the floor.