Select the correct answer. What is the formula of the ionic compound formed by the elements lithium and oxygen? A Li₂O OB. LIO OC. LiO2 OD. Li202 Reset Nel app. edmentum. com/.../aHROCHM6Ly9mMS5hcHAUZWRtZW5 0dWOUY29tL2xlYXJUZXItdWkvdXNlci1hc3 NpZ25tZW50LzQ5MDYWN​

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

2b2t

explanation:

2b2t