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Equations of Motion Question - HSN forum

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Equations of Motion Question


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#1 Karennmm

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Posted 13 September 2009 - 05:28 PM


An artificial hare travels along a straight section of track at a constant speed of 14 m/s.
The track distance is 200m.
A dog with a reaction time of 0.4s is released at the instant the hare passes the starting line.
The dog accelerates at a constant rate of 2.5s and reaches a speed of 15m/s. This speed is maintained for 7.5s, after which the dog begins to decelerate at a rate of 0.5m/s/s until it has covered 200m.

a) calculate the distance the dog has run, upto the instant at which it starts to decelerate.

b)i) calulate the speed of the dog at the 200m mark.
ii) calculate the time the dog takes to cover this distance.



Could you help maybe by giving pointers rather than the answer so that I can learn from it
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#2 Gordi66

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Posted 20 November 2009 - 11:48 PM

Hi,your question is not quite clear. Does the dog accelerate FOR 2.5sec. or does it accelerate at a rate of 2.5 m/s/s ? Please clarify this and then we can continue with the method.





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