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Date May 2017 Marks available 6 Reference code 17M.2.SL.TZ2.S_7
Level Standard Level Paper Paper 2 Time zone Time zone 2
Command term Find and Justify Question number S_7 Adapted from N/A

Question

Note:     In this question, distance is in metres and time is in seconds.

 

A particle moves along a horizontal line starting at a fixed point A. The velocity v of the particle, at time t , is given by v ( t ) = 2 t 2 4 t t 2 2 t + 2 , for 0 t 5 . The following diagram shows the graph of v

M17/5/MATME/SP2/ENG/TZ2/07

There are t -intercepts at ( 0 ,   0 ) and ( 2 ,   0 ) .

Find the maximum distance of the particle from A during the time 0 t 5 and justify your answer.

Markscheme

* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.

METHOD 1 (displacement)

recognizing s = v d t     (M1)

consideration of displacement at t = 2 and t = 5 (seen anywhere)     M1

eg 0 2 v and 0 5 v

 

Note:     Must have both for any further marks.

 

correct displacement at t = 2 and t = 5 (seen anywhere)     A1A1

2.28318 (accept 2.28318), 1.55513

valid reasoning comparing correct displacements     R1

eg | 2.28 | > | 1.56 | , more left than right

2.28 (m)     A1     N1

 

Note:     Do not award the final A1 without the R1.

 

METHOD 2 (distance travelled)

recognizing distance = | v | d t     (M1)

consideration of distance travelled from t = 0 to 2 and t = 2 to 5 (seen anywhere)     M1

eg 0 2 v and 2 5 v

 

Note:     Must have both for any further marks

 

correct distances travelled (seen anywhere)     A1A1

2.28318, (accept 2.28318 ), 3.83832

valid reasoning comparing correct distance values     R1

eg 3.84 2.28 < 2.28 ,   3.84 < 2 × 2.28

2.28 (m)     A1     N1

 

Note:     Do not award the final A1 without the R1.

 

[6 marks]

Examiners report

[N/A]

Syllabus sections

Topic 5 —Calculus » SL 5.5—Integration introduction, areas between curve and x axis
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