Answer to Question #173361 in Physics for Richard

Question #173361

The car is moving at a speed of 50 km / h. At one point the driver starts to brake abruptly and the car stops after 35 m from the moment the driver applied the brakes. Determine the car acceleration intensity during the braking process.


1
Expert's answer
2021-03-21T11:24:20-0400

We can find the car acceleration as follows:


v2=v02+2ad,v^2=v_0^2+2ad,a=v2v022d,a=\dfrac{v^2-v_0^2}{2d},a=0(13.88 ms)2235 m=2.75 ms2.a=\dfrac{0-(13.88\ \dfrac{m}{s})^2}{2\cdot35\ m}=-2.75\ \dfrac{m}{s^2}.

The sign minus means that the car decelerates.


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