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25-10-2020
Physics

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A car traveling at 30 m/s is brought to rest at a constant rate in 20 s by applying the brake. a) What is its acceleration? b) How far did it travel after the brake was applied?

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pfellas pfellas

25-10-2020

acceleration = -30/20 = -1.5 m.s^2
V^2 = U ^2 + 2 a s
0 = 900 - 2 x 1.5 x s
3 s = 900
s = 300 m

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