As you are headed to class, your friend leans out the window of your apartment 10 mabove you and shouts that you took her car keys rather than your own. Since you are in ahurry, you decide to toss your friend's keys up to her while she drops your keys down toyou.You throw the keys just hard enough to reach her outstretched hand. At what heightabove you will the two sets of keys pass each other?

Consider the key which is thrown from the window as case 1.In this case, the initial velocity of key…

Answered: As you are headed to class, your friend…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter6: Motion In Two Dimensions

Section: Chapter Questions

Problem 76A

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Here’s an interesting challenge you can give to a friend. Hold a $1 (or larger!) bill by an upper corner. Have a friend prepare to pinch a lower corner, putting her fingers near but not touching the bill. Tell her to try to catch the bill when you drop it by simply closing her fingers. This seems like it should be easy, but it’s not. After she sees that you have released the bill, it will take her about 0.25 s to react and close her fingers—which is not fast enough to catch the bill. How much time does it take for the bill to fall beyond her grasp? The length of a bill is 16 cm.
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After driving at a steady speed for 30km, Mario reacher the expressway where he increased his speed to 45km/hr. If after 120km of travel on the expressway his total travel time was 2 hours, what was his speed before reaching the expressway?
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