A mass of 0.080 kg hangs from a vertical spring in the lab room. You pull down o

Question

A mass of 0.080 kg hangs from a vertical spring in the lab room. You pull down on the mass and throw it vertically downward. The speed of the mass just after leaving your hand is 3.20 m/5. While the mass moves downward a distance of 0.06 m, how much work was done on the mass by the Earth? Include the appropriate sign. Work done by Earth = 047088 J The speed of the mass has decreased to 1.63 m/s. How much work was done on the mass by the spring? Include the appropriate sign Work done by spring = J

Explanation / Answer

part B :

from Work Energy theroem

net Work Done = change in KE

WNet = 0.5 mv^2 - 0.5 mu^2

Wnet = 0.5* 0.08 * (3.2^2 -1.6^2)

Wnet = 0.3072 J

Work Done by spring = -0.3072 J

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