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Stage: 5 Challenge Level: Challenge Level:1  Why do this
problem?  This problem gives an interesting situation in which
simple equations of mechanics can be used in a non-trivial way.
The problem arose from a real-life query which would work well
as either a homework task or a discussion point at the start or
end of a mechanics module.  Possible Approach  This problem
draws together the following points 1) Modelling assumptions in
mechanics 2) The implications of motion under constant power 3)
The implications of motion under constant acceleration 4)
Conversion of units  As such, it would be a good activity to
draw strands of work together at the end of a mechanics module.
Discuss the problem together. How would students answer this
question if called in as an expert witness by a genuine court?
What factors would need to come into the analysis? They should
be encouraged to question and