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mujadeo
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Homework Statement
A car moving at a speed of 27 m/s enters a curve that describes a quarter turn of radius 126 m. The driver gently applies the brakes, giving a constant tangential deceleration of magnitude 1.2 m/s2.
Homework Equations
a) Just before emerging from the turn, what is the magnitude of the car's acceleration?
The Attempt at a Solution
heres what i know, but can't seem to put it all together for this problem.
v-initial = 27m/s
v-final (as it emerges from the turn) = ?
a = 1.2 (the radial acceleration component has to be zero because it is going round an arc right? (pie/2 .. also s = 197.9m )
(the tangetial acceleration is the one that changes, correct?)
I need to find v-final but how can i do that without the time?
Please help!