Edexcel A Level Maths (9MA0) : June 2019 Paper 32 (Mechanics)

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My first attempt at an A Level exam walkthrough, and I was slightly ill when recording, but here it is! I decided to start with Paper 32 : Mechanics.

Introduction: 0:00

𝐐𝐔𝐄𝐒𝐓𝐈𝐎𝐍 𝟏
Introduction: 0:53
Part a): 1:23
Part b): 3:04

𝐐𝐔𝐄𝐒𝐓𝐈𝐎𝐍 𝟐
Introduction: 8:39
Part a): 9:04
𝘈𝘭𝘵𝘦𝘳𝘯𝘢𝘵𝘪𝘷𝘦 𝘮𝘦𝘵𝘩𝘰𝘥 : 16:12
Part b): 17:40

𝐐𝐔𝐄𝐒𝐓𝐈𝐎𝐍 𝟑
Introduction: 23:20
Part a): 24:29
Part b): 34:45
Part c): 37:44

𝐐𝐔𝐄𝐒𝐓𝐈𝐎𝐍 𝟒
Introduction: 39:07
Part a): 40:08
Part b): 41:28
Part c): 56:16

𝐐𝐔𝐄𝐒𝐓𝐈𝐎𝐍 𝟓
Introduction: 58:20
Part a): 59:01
Part b): 1:06:42
Part c): 1:15:44
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How come the normal reaction force drawn at 41:49 for point A is not perpendicular to the ramp?

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For question 2, is it wrong to assume that displacement = 0 when t = 0?

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