In the absence of any external forces, objects of different masses will fall at the same rate, regardless of their weight. This phenomenon is known as the equivalence principle and is a fundamental principle of gravity.
Therefore, the bowling ball and the 30-pound hammer, if dropped from the same height, will hit the ground at the same time. This result is independent of their masses or weights.
This can be explained by the fact that the acceleration due to gravity (9.8 m/s²) is the same for all objects near the Earth's surface, regardless of their masses. The only factor affecting the time it takes for an object to fall is the height from which it is dropped. In the absence of air resistance or other external forces, both objects will experience the same acceleration and reach the ground simultaneously.