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6th Edition

Stewart + 5 others

Publisher: Cengage Learning

ISBN: 9780840068071

Chapter 1.2, Problem 101E

**(a)**

To determine

The speed of the skidding car when the brakes are applied.

Expert Solution

The speed of the skidding car when the brakes are applied is

**Formula used:**

The distance is calculated using the formula

Where *s* is the speed of the skidding car when the brakes were applied in *f* is the coefficient of friction of the road, *d* is the distance that car skids after the brakes are suddenly applied in

**Calculation:**

Given that, the distance that car skids on wet concrete road after the brakes are suddenly applied is

Further, the coefficient of friction of wet concrete road is

Substitute *f*, *d* to calculate *s* as shown below.

Therefore, the speed of the skidding car when the brakes were applied is

**(b)**

To determine

The distance that car skids on the wet tar road.

Expert Solution

The distance that car skids on the wet tar road is

Given that, the speed of the skidding car on wet tar road is

Further note that, the coefficient of friction of wet concrete road is

Substitute *f*, *s* to calculate *d* in the formula mentioned in sub-part (a) as shown below.

Therefore, the distance that car skids on the wet tar road is