When finding the mean, or average, of a set of numbers you divide the sum of the group of numbers by the number of items in the group.
What is the average height for the 3 trials listed below?
6 cm
4 cm
2 cm
12 cm
6 cm
2 cm
4 cm

4 cm

Explanation:

To figure out the mean/average add the number together and then divide the number on how many numbers are there.

6+4+2 = 12

12/3 = 4

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

14 days is the half-life of phosphorus-32