Which answer below correctly identifies the type of change and the explanation for the change in calcium carbonate?

physical change because even though a state change was observed, the calcium carbonate retained its original properties

physical change because even though a particle size change was observed, the calcium carbonate retained its original properties and was not transformed into a new substance

chemical change because a state change was observed, which indicated that the calcium carbonate was transformed into a different substance

chemical change because a particle size change was observed, which indicated that the calcium carbonate was transformed into a different substance

B (The Second Option)

Explanation:

Physical Change because even though a particle size change was observed, the calcium carbonate retained its original properties and was not transformed into a new substance.

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