In coming to a stop a car leaves skid marks 82m long on the, Ask an Expert

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Q. Point charges of +1X 10-9C, +1X 10-9 C, and -2 X 10-9, are located at the vertices of an equilateral triangle. Find out the magnitude of the electric field at the center of the triangle, which is 10cm from each vertex.

Q. In coming to a stop, a car leaves skid marks 82m long on the highway. Assuming a deceleration of 6m/s2, estimate the speed of the car just before braking.

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