Final answer:
The mass of the beach ball is calculated by dividing its momentum (0.25 kg·m/s) by its velocity (0.5 m/s), yielding a mass of 0.5 kg.
Step-by-step explanation:
To find the mass of the beach ball, we can use the formula m = p/v, where m is the mass, p is the momentum, and v is the velocity or speed. In this case, the momentum is given as 0.25 kgm/s. We can plug this value into the formula along with the speed of 0.5 m/s to find the mass:
m = 0.25 kgm/s / 0.5 m/s = 0.5 kg
Therefore, the mass of the beach ball is 0.5 kg.