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The Equations of Motion

A train is mo...

Question

A train is moving at a speed of 90km/h.On applying brakes,a retardation of 2.5m/ S2 is created.At what distance before, should the driver apply brakes to stop the train

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Solution

v²=u²+2aS
v=0 km/h= 0 m/s
u=90 km/h = 90×(5/18)
=25 m/s
a= -2.5m/s²

0²=25² -2×2.5×S
S=625÷5
=125 m

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