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 :)

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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chemical properties of thing