Edexcel A-Level Maths 2020 Paper 3 (Mechanics) Q2 | SUVAT Vectors

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📺 WATCH THE FULL PAPER:    • Edexcel A-Level Maths 2020 Paper 3 (9MA0/3...   🧠 MORE VECTOR SUVATS :    • Chapter 8: Further Kinematics  

In this video, Lee Guffick works through Edexcel A-Level Maths 2020 Paper 3 (Mechanics) Question 2, a brilliant Mechanics question combining SUVAT and vectors.

You’ll see how to apply constant acceleration in vector form, using v = u + at and s = ut + ½at², then solve for time by isolating the j-components to form a quadratic (before finding λ from the i-components).

This is exactly the kind of “quietly tricky” question that rewards students who stay calm and methodical — and it’s very typical of the precision Edexcel love in Paper 3.

⏱️ TIMESTAMPS:
00:00 Introduction
00:10 Identifying constant acceleration in vector form
00:55 Using v = u + at to find velocity at t = 2
01:40 Final velocity answer
01:50 Setting up part (b): origin → point A (vector displacement)
03:20 Using s = ut + ½at² in vector form
04:10 Key insight: isolate the j-components to find t
05:00 Solving the quadratic → t = 9/5 = 1.8s
07:15 Using i-components to find λ
08:00 Final value of λ
09:10 Recap + exam technique pointers

✏️ TOPICS COVERED:

SUVAT with constant acceleration in vectors

Using v = u + at in i and j form

Using s = ut + ½at² for displacement vectors

Isolating components (solving using j first)

Forming and solving a quadratic for time

Substituting back to find an unknown constant (λ)

Exam accuracy and method marks in Mechanics

💯 EXAM TIPS:

If acceleration is constant → think SUVAT immediately

Treat vectors like two separate SUVAT problems: i and j

The quickest route is often to isolate one component (here, the j-component)

Don’t waste time overworking the quadratic — using your calculator is absolutely fine

Once you’ve found t, substitute into the other component to finish the question cleanly

📚 ABOUT GUFFICK TUITION:
Lee Guffick is a former Head of Mathematics and A-Level Examiner, helping students achieve A/A grades* and secure places at top universities including Oxford, Cambridge, and the Ivy League.

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