A mass of 0.079 kg hangs from a vertical spring in the lab room. You pull down o

Question

A mass of 0.079 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 3.80 m/s.

(a) While the mass moves downward a distance of 0.11 m, how much work was done on the mass by the Earth? Include the appropriate sign.
Work done by Earth = J

(b) At the instant in part (a) when the mass has moved downward a distance of 0.11 m, the speed of the mass has decreased to 1.52 m/s. How much work was done on the mass by the spring? Include the appropriate sign.
Work done by spring = J

Explanation / Answer

a) W=0.079*9.81*0.11 =0.0853J b) 0.079*(3.8*3.8)/2 = - 0.079*9.81*0.11 + 0.079*(1.52*1.52)/2 +E E is energy stored in spring W=-E=-0.564 J

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