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Q. A helicopter is ascending vertically with a speed of 1.50 m/s. At a height of 80 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?

Q. We release the block at x = 14.0 cm. How much work does the spring do on the block when the block moves from xi =+8.0 cm to (a)x=+6.0 cm, (b)x=-6.0 cm, (c)x=-8.0 cm, and (d)x=-10.0 cm?

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