Physics
Gigih
2015-11-02 05:05:42
A book with a mass of 2.5 kg falls from a high shelf in a library. At a height of 2.0 meters its velocity is 2 m/s. What is the mechanical energy of the book? Answers are: 5J 44J 49J 54J
ANSWERS
spacespikeboots
2015-11-02 06:45:33

 E=Ek+Ep = m*v^2/2 + m*g*h = 2.5*4/2 + 2.5*9.8*2 = 5+49=54J

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