The momentum of a teenager and his is 345 kg m/s, . Their velocity of is 9.0 m/s. What is the combined mass of the teenager and his RipStick?

Explanation:

The mass of the teenager and his RipStick can be found by using the formula

where

p is the momentum

v is the velocity

So we have

We have the final answer as

Hope this helps you

Explanation:

The momentum = 345 kg m/s

The velocity = 9.0 m/s

The mass = ?

345 kg m/s = 9.0 m/s * m      divide by 9

345 kg m/s / 9 = 9 /9 * m

38.3 kg            = m

There are 2 sig digs. so the answer should be 38 kg.  

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

it is the most commonly accepted one