A mass of 0.077 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 5.00 m/s.
(a) While the mass moves downward a distance of 0.12 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 0.12 m, the speed of the mass has decreased to 3.00 m/s. How much work was done on the mass by the spring? Include the appropriate sign.
Work done by spring = J