Answer :
Final answer:
The mass of the man standing on the diving board remains 78 kg since mass is an intrinsic property that does not change based on the man's position.
Explanation:
The mass of the man standing motionless at the end of the diving board, given his mass is 78 kg, is 78 kg. This is due to the fact that mass is an intrinsic property of an object that does not change regardless of location or position. Whether the man is on a diving board, on the ground, or in any other situation where he is not interacting with other objects in a way that would alter his total mass (such as holding something), his mass remains the same.
