A man steps outside one winter day to go to work. His icy driveway is 8.0 m long from top to mailbox, and it slopes downward at 20° from the horizontal. He sets his briefcase on the ice at the top while opening the garage, and the briefcase slides down the driveway. Ignore friction. (a) What is its acceleration? (b) How many seconds does it take to get halfway to the mailbox? (c) How many seconds does it take to reach the mailbox? (d) What is its speed at the instant it reaches the mailbox?

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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A man steps outside one winter day to go to work. His icy
driveway is 8.0 m long from top to mailbox, and it slopes downward
at 20° from the horizontal. He sets his briefcase on the
ice at the top while opening the garage, and the briefcase slides
down the driveway. Ignore friction. (a) What is its acceleration?
(b) How many seconds does it take to get halfway to the mailbox?
(c) How many seconds does it take to reach the mailbox?
(d) What is its speed at the instant it reaches the mailbox?

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