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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 44…

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 44…
asked 101k views
1 vote
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

asked
User Brendan Quinn
by
9.1k points

2 Answers

7 votes

Answer: 54 Joules

Step-by-step explanation:

got it right in my exam

answered
User Sakkeer A
by
9.1k points
2 votes
E=Ek+Ep = m*v^2/2 + m*g*h = 2.5*4/2 + 2.5*9.8*2 = 5+49=54J
answered
User Mbb
by
7.9k points
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