Final answer:
Factors like greater experience and strength, a different throwing technique, and better aim could explain why Timmy's grandpa's rocks go farther and faster than Timmy's when thrown into a pond.
Step-by-step explanation:
When comparing the distances and speeds of rocks thrown into a pond by Timmy and his grandpa, there are several possible reasons why Timmy's grandpa's rocks go farther and faster. One significant factor is that Timmy's grandpa has more experience and strength, which likely allows him to throw rocks with more force. This results in a greater initial velocity and subsequently more distance covered. Another possibility is that Timmy's grandpa uses a different technique or throwing style that optimizes the rock's trajectory and velocity. Lastly, Timmy's grandpa might simply have better aim, which can affect the effectiveness of the throw. The correct reasons can be a combination of these factors and not solely attributed to the size of the rocks, as larger rocks do not naturally travel farther and faster unless thrown with an appropriate force.