Assertion: Gases completely fill the vessel in which they are kept.
Reason: In the gaseous state, particles move freely and have greater space between them. *

Both assertion and reason are true and reason is correct explanation of the assertion
Both assertion and reason are true but reason is not a correct explanation of the assertion
Assertion is true but the reason is false
Both assertion and reason are false

(A)

Explanation:

Answer is (a) Both the assertion and the reason are correct and re!son is the correct explanation of the assertion

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

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