Two stones are thrown simultaneously from a height of 500m. The first stone is t

Question

Two stones are thrown simultaneously from a height of 500m. The first stone is thrown vertically downward at a speed of 10 m/s, when the second stone is thrown vertically upward at a speed of 10 m/s. Immediately after the two stones are thrown, the difference in their speeds (|vdown| - |vup|) will Increase with the time Decrease with the time Remain the same Not enough information given In a construction site accident, a chain holding a large concrete slab (m = 600 kg) breaks and the slabs falls 30 meters straight down, crushing an unoccupied, parked truck. How fast is the slab moving when it first impacts the truck? 9.80 m/s 12.32 m/s 24.25 m/s 588.0 m/s 5.8 m/s

Explanation / Answer

h = 30

m = 600

g = 9.81

by energy conservation,

m*g*h = 0.5*m*v*v

v = 24.25 m/s

(c)

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