Grass starts with 30,000 kcal of energy. A cheetah would acquire kcal of energy after it ate a zebra that had consumed the grass.

300 kcal of energy.

Explanation:

Grass produces 30,000 kcal of energy through the process of photosynthesis. The zebra eat this grass and would acquire 3000  kcal of energy because only 10% of energy will transferred from one trophic level to another. In this way, when the cheetah feed on zebra, it acquire 300  kcal of energy and again 10% of energy is transferred from zebra to cheetah while the remaining release in the atmosphere in the form of heat energy.