A 5.15 g sample of calcium sulfide was decomposed into its constituent elements, producing 2.86 g of calcium and 2.29 g of sulfur. Which of the following statements are consistent with the law of constant composition (definite proportions)? Select all that apply. A.Every sample of calcium sulfide will have 44.4% mass of calcium. B.Every sample of calcium sulfide will have 2.86 g of calcium. C.The mass ratio of Ca to S in every sample of calcium sulfide is 1.25.D. The ratio of calcium to sulfur will vary based on how the sample was prepared. E.The mass percentage of calcium plus the mass percentage of sulfur in every sample of calcium sulfide equals 100%.

first let us lay out the formula for potential

and kinetic energy:

pe = mgh

ke = (mv^2)/2

where: m=mass, v=velocity, g=gravitational

acceleration, h=height

calculating for mass using the known values of

pe:

340j = m (9.81 m/s^2) (50ft) (1m/3.28ft)

m = 2.27 kg

the law of conservation of energy states that

energy is neither created nor destroyed. therefore, the change in kinetic

energy from 50 ft to 35 ft would be equal to the change in potential energy

from 50 ft to 35 ft. however it would be opposite in signs since one is losing

while other is gaining.

ke(35ft) – ke(50ft) = - [ pe(35ft) – pe(50ft]

ke(50ft) = 0 since the brick is initially at rest

ke(35ft) = 340j - 2.27kg (9.81 m/s^2) (35ft)

(1m/3.28 ft)

ke(35ft)

= 102.38 j

16

explanation:

the marks go by 4s

explanation:

a