The graph in the figure shows the position of an object as a function of time. The letters H-L represent particular moments of time. At which moments shown (H, I, etc.) is the speed of the object
(a) the greatest?
(b) the smallest? 
Definitions:
Long-Run Equilibrium
A state in which all firms in a market or industry are making normal profits, and there is no incentive for existing firms to exit the market or for new firms to enter.
Marginal Cost
The expenditure associated with creating one more unit of a good or service.
Total Revenue
The complete amount of money received by a company for goods sold or services provided during a specific period.
Increasing-Cost Industry
An industry where the costs of production increase as output increases, often due to factors like resource depletion or higher input prices.
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