Two objects, A and B, are moving along two different straight lines at constant speeds. With reference to a particular coordinate system in which distance is measured in metres, the position of A at time t (in minutes) is (2t − 1, 3t + 3), and the position of B is (5t − 2, 2t + 5). A student attempts to find the shortest distance between A and B as attached. There are two lines where the working does not follow on from the previous line. . Find and describe the two mistakes. Write out a correct solution

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Two objects, A and B, are moving along two different straight lines at constant speeds. With reference to a particular coordinate system in which distance is measured in metres, the position of A at time t (in minutes) is (2t − 1, 3t + 3), and the position of B is (5t − 2, 2t + 5).

A student attempts to find the shortest distance between A and B as attached. There are two lines where the working does not follow on from the previous line.

. Find and describe the two mistakes. Write out a correct solution

d = 10t2 – 10t + 5
= 10 (t2 – t) +5
= 10 (t – })? – 1 + 5
= 10 (t – )? + .
The minimum value of d occurs when t = }.
Hence the minimum distance is 4.8 m (to 2 s.f.).
Transcribed Image Text:d = 10t2 – 10t + 5 = 10 (t2 – t) +5 = 10 (t – })? – 1 + 5 = 10 (t – )? + . The minimum value of d occurs when t = }. Hence the minimum distance is 4.8 m (to 2 s.f.).
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