A rock is thrown vertically. During the last second of its flight, it covers half the total distance traveled. What is the maximum possible flight time for the rock? Assume that the acceleration due to gravity is 10 m/s2.

The 2013–2014 season of Challenges had a strong finish, with many readers from all over the world submitting the solutions to our March, April, and May problems. As always, we hope the students will become more actively engaged this year; we also remind that reader-contributed Challenges are welcome!

We are pleased to recognize the following contributors:

  • Phil Cahill (The SI Organization, Inc., Rosemont PA)

  • David A. Cornell (emeritus, Principia College, Elsah, IL)

  • Don Easton (Lacombe, Alberta, Canada)

  • Peter Eggers, student (John Tyler Community College, Midlothian, VA)

  • Fernando Ferreira (Universidade da Beira Interior, Covilhã, Portugal)

  • Josh Gates (Tatnall School, Greenville, DE)

  • Supriyo Ghosh (KolKata, India)

  • John F. Goehl, Jr. (Barry...

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