Speed Time Graphs (Q2 A2 P3 Edexcel 2024)

Описание: In this video, Lee Guffick breaks down Question 2 from Edexcel A Level Maths, A2 Mechanics Paper 3 (2024) — a classic speed–time graph problem about an athlete running a 200 m race. This is a staple question in Mechanics, combining gradients, areas under graphs, trapeziums, and interpreting motion from a model.
Lee shows exactly how to read the graph, calculate acceleration, find distance travelled from the area, and solve for the unknown final speed u — all with the clarity and exam-focused method that students in his small groups love.

⏱️ TIMESTAMPS:
0:00 – Intro to the speed–time graph
0:07 – Understanding the athlete’s motion model
0:20 – Part (a): Finding the acceleration from the gradient
1:02 – Part (b): Using area under the graph to find distance
1:30 – Triangle + rectangle area breakdown
1:59 – Total distance in first 18 seconds
2:03 – Part (c): Using the total 200 m to solve for u
2:22 – Area of the trapezium (final 6 seconds)
2:49 – Forming the equation with one unknown
3:05 – Rearranging to isolate u
3:24 – Final answer: u=103 m/su = \frac{10}{3} \text{ m/s}u=310​ m/s
3:31 – Summary & next video

✏️ TOPICS COVERED:


Speed–time graphs in A Level Mechanics


Gradient as acceleration


Area under graph as distance


Constant acceleration & constant speed segments


Using triangles, rectangles, and trapeziums for total distance


Solving equations involving motion models


Interpreting a full 200 m race model



💯 EXAM TIPS:


Always label the axes and units before working — it avoids easy mistakes.


When dealing with speed–time graphs, remember:


Gradient → acceleration


Area → distance




Break complex graphs into simple shapes: triangle, rectangle, trapezium.


If the question gives a total distance (like 200 m), use it to form an equation with the unknown speed.


Check your working at each step — Paper 3 often rewards accuracy over creativity.



📚 ABOUT GUFFICK TUITION:
Lee Guffick is a former Head of Mathematics and A-Level Examiner, known for helping students achieve A/A grades* and win places at top universities including Oxford, Cambridge, Imperial, UCL, and leading US institutions in the Ivy League.
His teaching emphasises clarity, structured working, and deep understanding — the exact skills needed to succeed in A Level Mechanics.

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