Khan/khan-exercises — Issue #14051: Kinematic equations - Bad rounding
Author: KhanBugz
Created: 2012-02-17 03:39:51+00:00
State: open
Labels: chrome, wrong-or-unclear

Reporter: lemaire.adrien@gmail.com

This exercise ask to round to the nearest tenth, and provide the following solution:

d=(18.2ms)(13.6s)+12(−18.9ms2)(13.6s)2
d=−1500.3m

That is wrong, the answer being -1500.351999999..., a rounding to the nearest tenth should be -1500.4m

[kinematic_equations.html?seed=145&problem=accelerated](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/kinematic_equations.html?seed=145&problem=accelerated&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/kinematic_equations.html?seed=145&problem=accelerated&debug&activity=%5B%5B%22incorrect-activity%22%2C%22%5B%5B%5C%22-1500.4%5C%22%2C%5C%22m%5C%22%5D%5D%22%2C119%5D%2C%5B%22incorrect-activity%22%2C%22%5B%5B%5C%221500.4%5C%22%2C%5C%22m%5C%22%5D%5D%22%2C198%5D%2C%5B%22incorrect-activity%22%2C%22%5B%5B%5C%221500%5C%22%2C%5C%22m%5C%22%5D%5D%22%2C3%5D%2C%5B%22incorrect-activity%22%2C%22%5B%5B%5C%22-1500%5C%22%2C%5C%22m%5C%22%5D%5D%22%2C5%5D%2C%5B%22hint-activity%22%2C%220%22%2C3%5D%2C%5B%22hint-activity%22%2C%220%22%2C27%5D%2C%5B%22hint-activity%22%2C%220%22%2C29%5D%2C%5B%22incorrect-activity%22%2C%22%5B%5B%5C%22-1500.4%5C%22%2C%5C%22m%5C%22%5D%5D%22%2C81%5D%5D)

[[["-1500.4","m"]],[["1500.4","m"]],[["1500","m"]],[["-1500","m"]],[["-1500.4","m"]]]

Mozilla/5.0 (X11; Linux i686) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.46 Safari/535.11

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