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Homework Statement
Attempting to stop on a slippery road, a car moving at 80 km/h skids across the road at a 30 degree angle to its initial motion, coming to a stop in 3.9 s.
Determine the average acceleration in m/s^2, using a coordinate system with the x-axis in the direction of the car's original motion and the y-axis toward the side of the road to which the car skids.
The Attempt at a Solution
I did a whole chunk of workings but they're aren't working out to give me a sensible answer.
Could someone give me a leg up?
0ms^-1 = 22.2ms^-1 + acos30°(3.9s)
a = -6.57ms^-2
vx = 22.2ms^-1 + (-6.57ms^-1 cos30)(3.9s)
vy = (-6.57ms^-1 sin30)(3.9s)
I square root the square of vx and vy to get the resultant, then, divide |v| by t = 3.9s but it's not yield -5.7ms^-1.
What is wrong here?
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