Final answer:
The approximate base of the cumulus clouds in this scenario is approximately 4,500 ft above the ground level.
Step-by-step explanation:
The approximate base of cumulus clouds can be determined by finding the difference between the temperature and the dewpoint at 2,000 ft MSL. In this case, the temperature is 10 degrees Celsius and the dewpoint is 1 degree Celsius, so the temperature-dewpoint spread is 9 degrees Celsius. The lapse rate is typically 2 degrees Celsius per 1,000 ft. Therefore, we can estimate that the base of the cumulus clouds is approximately 4,500 ft above the ground level.