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12 Chapter 1 • Dynamics Example 1.10


A missile travelling at a constant velocity takes 5 seconds to reach its target 1 km away. Use scales of 2 cm = 1 s and 1 cm = 100mand draw a displacement/time graph. From the graph, determine; (a) (b) (c)


the gradient of the slope, the velocity of the missile, and the time a similar missile would take to reach a target 650maway.


Solution: y


1 000 800 (a) 650 m (Oa) 600 400 200 (b) 0


(a) (b)


From the graph: 3t = 5 – 0 = 5 s and the corresponding 3s = 1 000 – 0 = 1 000m


3


s t


\v = 1 000 (c) 5 = 200 m/s Fromthe graph; for 650m(Oa), time = 3,25 s (Ob) 1


Gradient = 3 v = 3


3 2


y x = 1 000


3


Time (t) in s 5 = 200


4 5 x


3,25 s (Ob)


Displacement (s) in m


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