Final answer:
The key physical quantity associated with the motion of a golf ball propelled with an initial velocity of 60 m/s is Momentum (D).
Step-by-step explanation:
The key physical quantity associated with the motion of a golf ball propelled with an initial velocity of 60 m/s is Momentum (D).
Momentum is defined as the product of an object's mass and velocity. In this case, the golf ball's momentum would be equal to the product of its mass and the initial velocity.
Therefore, the correct answer is D) Momentum.