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Date May 2014 Marks available 8 Reference code 14M.2.sl.TZ1.6
Level SL only Paper 2 Time zone TZ1
Command term Find Question number 6 Adapted from N/A

Question

Ramiro and Lautaro are travelling from Buenos Aires to El Moro.

Ramiro travels in a vehicle whose velocity in ms1 is given by VR=40t2, where t is in seconds.

Lautaro travels in a vehicle whose displacement from Buenos Aires in metres is given by SL=2t2+60.

When t=0, both vehicles are at the same point.

Find Ramiro’s displacement from Buenos Aires when t=10.

Markscheme

METHOD 1

SL(0)=60   (seen anywhere)     (A1)

recognizing need to integrate VR     (M1)

eg     SR(t)VRdt

correct expression     A1A1

eg     40t13t3+C

 

Note:     Award A1 for 40t, and A1 for 13t3.

 

equate displacements to find C     (R1)

eg     40(0)13(0)3+C=60, SL(0)=SR(0)

C=60     A1

attempt to find displacement     (M1)

eg     SR(10), 40(10)13(10)3+60

126.666

12623 (exact), 127 (m)     A1     N5

 

METHOD 2

recognizing need to integrate VR     (M1)

eg     SR(t)=VRdt

valid approach involving a definite integral     (M1)

eg     baVRdt

correct expression with limits     (A1)

eg     100(40t2)dt, 100VRdt, [40t13t3]100

66.6666     A2

SL(0)=60   (seen anywhere)     (A1)

valid approach to find total displacement     (M1)

eg     60+66.666

126.666

12623   (exact), 127 (m)     A1     N5

 

METHOD 3

SL(0)=60     (seen anywhere)     (A1)

recognizing need to integrate VR     (M1)

eg     SR(t)=VRdt

correct expression     A1A1

eg     40t13t3+C

 

Note:     Award A1 for 40t, and A1 for 13t3.

 

correct expression for Ramiro displacement     A1

eg     SR(10)SR(0), [40t13t3+C]100

66.6666     A1

valid approach to find total displacement     (M1)

eg     60+66.6666

12623 (exact), 127 (m)     A1     N5

[8 marks]

Examiners report

[N/A]

Syllabus sections

Topic 6 - Calculus » 6.6 » Kinematic problems involving displacement s, velocity v and acceleration a.
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