1. Fill in the blank spaces by choosing correct words from the list given below : 1. Burning of coal is a change.
2. Distillation of petroleum to form petrol is a change.
3. Melting of wax near the wick of a candle is change, but the burning of wax in the wick of the candle is change.
4. A mixture obtained on dissolving a solid in water is called
5. Iron on heating.​

1. Chemical Change

2.physical Change

3.Physical , Chemical

4.Solid-Liquid mixture

5.Expands

Explanation:

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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