8. A scientist designed an investigation to measure the distance required to stop a car on several different road surfaces. The car was traveling at a speed of 10 m/s at the beginning of each trial. Below are the results of her investigation. Which conclusion is best supported by the data from her investigation? The force of friction is greatest on asphalt. The forward force from the engine was greatest on ice. The forward force from the engine was greatest on asphalt. The force of friction is greatest on ice.

You this is right

You need to figure out at which x-value does the graph has a tangent line slope of -1.remember, the derivative is the slope of the tangent line. so find the derivative function and set it to equal -1 to find the x-value that will have a tangent line slope of 0.differentiate with the chain rule.    set the derivative to equal -1 and solve for x.      take log base 10 of both sides. also recall that  .    so the x-coord of the point of tangency is .the y-coordinate of this point of tangency can be calculated using the original function:     using point-slope form, the equation of the tangent line is      the x-intercept of this tangent line is when the graph is at y=0.    this rounds off to  .choice c.