Unformatted text preview: is compressed after the
mass falls on it, the elastic and gravitational potential energy are
J, for a total of J. Thus, J and
, which implies that cm.
(b) [6pt] How fast would the box be falling just before it hits the spring, in this case?
Energy conservation implies that so Then Note: Again, the mass was not needed, but you could use it to find an alternative solution.
Energy conservation implies that
J, as calculated above. therefore, 3. [20pt] Answer these multiplechoice questions by circling the correct letter. Showing your
work is not required, but partial credit is possible if you show your work. (a) [4pt] A 4.0 kg mass is moving with speed 2.0 m/s. A 1.0 kg mass is moving with speed 4.0
m/s. Both objects encounter the same constant braking force, and are brought to rest. Which
object travels the greater distance before stopping?
(A) The 4.0 kg mass. (B) The 1.0 kg mass. (C) Both travel an equal distance. (D) It cannot be determined from the information given. The work is the change in kinet...
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 Fall '12
 ScottYost
 Physics, Force, Friction, Kinetic Energy, Potential Energy, kg mass

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