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Maatttt0
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Homework Statement
A motorcyclist starts from rest at a point O and travels in a straight line. His velocity after t seconds is vms^-2, for 0 =< t =< T, where v = 7.2t - 0.45t^2. The motorcyclist's accelaration is zero when t = T.
Find the value of T.
Homework Equations
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The Attempt at a Solution
S = X
U = 0
V = 7.2t - 0.45t^2
a = 0
t = t
v = u + at
7.2t^2 - 0.45t = 0
0.45t(t - 16) = 0
Therefore t = 0 or 16
But the answer is 8.. I believe I'm getting the accleration part incorrect but I just cannot spot it.
Please help - thank you :)
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