Hey kkar.

There are a lot of questions that require different approaches.

Usually in mathematics, a lot of people get in the habit of resorting to formulas to solving problem X and when they can't match problem X with formula Y they get stuck (used to happen me all the time).

So what I might ask you is how you have been taught to do these problems and what formulas you have been given.

My guess is they gave you tonnes of formulas with a few superficial examples and expect you to have complete contextual understanding in one or two lectures but i'll wait for your response.