4 Britnee is texting and driving in her passenger car when she looks up and realizes that a big rig is fully stopped 16 meters from her on the road ahead. Her speed is shown. Britnee is a quick texter and fortunately also has a quick reaction time. Assume she hits the brakes immediately and manages to come to a stop just 1.5 meters from the rear of the big rig (her acceleration is constant). A) What was Britnee's acceleration while braking? Express your answer in SI units and also in “g's" (acceleration as a fraction of free fall acceleration). B) Now consider what would happen if her initial speed were only 25% greater than before. With the same acceleration you calculated in A, would Britnee collide with the truck? If so, how fast would her car have been moving at the moment of collision? C) What was Britnee's mistake in this situation? (this answer is not-for-credit)
4 Britnee is texting and driving in her passenger car when she looks up and realizes that a big rig is fully stopped 16 meters from her on the road ahead. Her speed is shown. Britnee is a quick texter and fortunately also has a quick reaction time. Assume she hits the brakes immediately and manages to come to a stop just 1.5 meters from the rear of the big rig (her acceleration is constant). A) What was Britnee's acceleration while braking? Express your answer in SI units and also in “g's" (acceleration as a fraction of free fall acceleration). B) Now consider what would happen if her initial speed were only 25% greater than before. With the same acceleration you calculated in A, would Britnee collide with the truck? If so, how fast would her car have been moving at the moment of collision? C) What was Britnee's mistake in this situation? (this answer is not-for-credit)
University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter3: Motion Along A Straight Line
Section: Chapter Questions
Problem 77P: There is a 25O-m-high cliff at Half Dome in Yosemite National Pad in California. Suppose a boulder...
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