Myriah wants to use dimensional analysis to find out how many centimeters (cm) are in 1.4 meters (m). which of these equalities will be useful for this calculation? 2.54 cm = 1 in. 1 m = 39.37 in. 1 cm = 10 mm 100 cm = 1 m

D: 100 cm = 1 m

Explanation:

she needs to know how many cm are in a meter

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

i just learnt this recently but i need to look through my notes again