She did not have a control group, and she did not expose all three samples to wind. Because her hypothesis was a combination of things, she needed to test the different combinations.
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The law of reflection states that "when a ray of light is reflected off a surface, the angle of incidence equals to the angle of reflection"
The angle of incidence is 62° means the angle of reflection is also 62°
The alarm is going off because the alarm has already been set to activate.
The unit for the speed was not given
If speed is 15km/h
and distance is 1.2km
Then using the formula
Speed = distance/time
Time = t
15 = 1.2/t
15t = 1.2
t = 1.2/15
t = 0.08hrs
But
1hr = 60seconds
0.08hrs = t
t = 60(0.08)
t = 4.8s
