Answer: The control group is the part where you see what happens when you change a variable you want to study/examine. Basically, you need the control group because you need something to see what happens when you change something.
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Answer:
<u> a = V final 2___v initial2</u>
28
Explanation:
By definition for contant acceleration <u>a = V final ___v initial</u>
t
Furthermore the average speed is <u>V abg = v initial +v final</u>
2
Combine these relationships to eliminate t. 8 = Vabg t.
Answer:
Explanation:
Given:
mass, 
time, 
velocity, 
coefficient of kinetic friction between wheels & pavement, 
According to first condition,
According to second condition,
<u>Magnitude of frictional force (which acts opposite to the direction of motion):</u>
where N is the normal reaction.
Now, the impulsive force on the wall if the brakes were applied during the crash:
I can't help if u don't write the full question
