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Gravity down the slope beats friction, so the block accelerates at a constant 1.40 m/s². That's why speed climbs in a straight line while distance curves upward. Distance is the area under the speed graph. Mass never appears in either sum.
Friction on a slope: change the angle or µ mid-slide and the block keeps the speed it already had.
Plenty of people follow the physics lecture and still freeze in the exam. Reading a derivation and producing one are different skills, and only one of them gets marked. So the lessons here are things you change, run and get wrong, not pages you read.
You describe the goal in your own words and the plan asks questions back until it is one you would follow. Goals usually look like these.
There is no fixed syllabus. The plan is built around your goal and drops what it does not need. These are the topics it draws from.
Each one has its own lesson block to try.
See how it works and what it costs.