While driving in your pickup truck down Highway 280 between San Francisco and Palo Alto, an asteroid lands in your truck
bed! Despite its 220 kg mass, the asteroid does not destroy
your 1200 kg truck. In fact, it landed perfectly vertically. Before
the asteroid hit, you were going 25 m/s. After it hit, how fast
were you going?
a 28 m/s
b 21 m/s
C 15 m/s
d 32 m/s

This question can be answered with the concept of Conservation of Momentum. Because momentum is always conserved, we can write an equation that can be used for this question:

+ = ( +  )

Since the asteroid is flying down vertically, it's speed in this equation can be disregarded and  is essentially 0 since we're measuring horizontal speed.

Therefore: = ( +  )

We can simplify this equation to make our life easier when we plug in the numbers to crunch the final value:

=  

There we go. Let's plug in the numbers:

=  

=

≈ 21 (m/s)

Option B

And there we have it! If you have any questions about my answer, just ask :)

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is