Solutions to 8.01SC Classical Mechanics on MIT OCW

Michigan State featured in korean manhwa "The Breaker: New Waves"

[Mechanics] In problem 2.3's solution, friction is ignored even though the prompt does not state that the surface is frictionless. Why is that? If friction is not mentioned in the problem statement, should I ignore it?

I found that part a was zero, but am struggling with part b

[Calculus: Improper Integrals & Limit Comparison] Cannot figure out part b, but found that part a is zero.

[Calculus AB - U substitution] why?

[Calc 1] How would i solve for part e?

[Calc C] don’t know how to match these solution graphs

[9th grade algebra] 9 or 1?

Just realized that if you rearrange the letters in "Nepomniachtchi" you get "Thicc IPhone Man." What does this mean for the WCC? Is Nepo teasing an Apple sponsorship?

What's your top song of the year?

[SAT math question] Quadratic

[Alg. 2] Can someone just tell me the answer to this? I’ll figure out how to do it later.

[Precalculus: Vectors] How do I find the tension in problem #87? This type of problem wasn't in examples.

[Precalculus: Limits and Continuity] Can someone explain this example to me? Where does the interval (1, 3) come from?

Just some questions I have about LVT.