Which of the following equations are dimensionally correct?
v_f=v_i+ax (10p)
y=(2m)cos⁡(kx), where k=2m^(-1)

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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scientific laws are the result of testing theories and proving them to be facts.

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)