Final answer:
The object dropped by Tyler will accelerate downward due to gravity. Upon hitting the water, it's the forces from the water that will determine if it sinks or floats.
Step-by-step explanation:
The question pertains to physics and specifically the concept of gravitational acceleration and forces experienced by an object in motion. When Tyler drops a 5 kg object off the roof, the object will accelerate downward due to gravity. If the object is a cat, as mentioned in a typo, it is known that cats can manipulate their bodies during a fall to land on their feet, but this does not change the fact that the center of mass of the cat is still accelerating downwards due to gravity at a uniform rate until it encounters a force, like the water in a pool, which decelerates it.
Upon hitting the water, the force exerted by the water will oppose the gravitational acceleration, potentially stopping the cat. Therefore, the correct answer is that the cat accelerates downward, and upon entering the water, experiences forces which can either make it sink or float, depending on its buoyancy and the surface tension of the water, but the question regarding the weight is misstated since weight is a measure of the gravitational force and does not increase on impact.