1. A box of unknown mass is sliding with an initial speed v i = 5.80 m/s across
ID: 1283148 • Letter: 1
Question
1. A box of unknown mass is sliding with an initial speed vi = 5.80 m/s across a horizontal frictionless warehouse floor when it encounters a rough section of flooring d = 3.40 m long. The coefficient of kinetic friction between the rough section of flooring and the box is 0.100. Using energy considerations, determine the final speed of the box after sliding across the rough section of flooring.
____ m/s
2. A light spring obeys Hooke's Law. It takes 30.7 J of work to stretch this spring from an elongation of 4.34 cm to an elongation of 5.34 cm.
(a) Is the amount of work required to increase the elongation of the spring from 5.34 cm to 6.34 cm greater than, less than, or equal to 30.7 J?
greater than
less than
equal to
(b) Verify your answer to part (a) by calculating the required work.
___ J
Explanation / Answer
1)KE?-KE?=W(fr)
mv?
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