Adult cheetahs, the fastest of the great cats, have a mass of about 74 and have been clocked at up to 70 (31 ).

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To understand the question, we need to break it down into two parts: the mass of adult cheetahs and their recorded speed.

1. Mass of adult cheetahs:
According to the question, adult cheetahs have a mass of about 74. However, it is not mentioned in which unit this measurement is given. To get a better understanding, we can assume it is in kilograms (kg) since that is a commonly used unit for measuring mass. Therefore, adult cheetahs have a mass of approximately 74 kg.

2. Recorded speed of adult cheetahs:
The question mentions that cheetahs have been "clocked" at up to 70 (31 ). Here, the speed of the cheetah is provided in a measurement that is not clear. It seems there might be a mistake or missing information in the question. However, we could interpret it in two possible ways:

a) The cheetah's recorded speed is 70 mph (miles per hour), which is equivalent to 31 meters per second (m/s). This would mean that the cheetah has been observed running at a top speed of 70 mph or 31 m/s.

b) The cheetah's recorded speed is 70 km/h (kilometers per hour), which is equivalent to approximately 19.4 m/s. In this case, the cheetah has been observed running at a top speed of 70 km/h or 19.4 m/s.

Without further clarification or information, it is difficult to determine the exact speed recorded for adult cheetahs.

In summary, based on the information provided, adult cheetahs have a mass of approximately 74 kg, and their recorded speed can be interpreted as either 70 mph (31 m/s) or 70 km/h (19.4 m/s) depending on the intended unit of measurement.