B - speed and direction are combined in another quantity, called velocity. It can be thought of as its speed in a particular direction. Speed is the corresponding scalar quantity, because it does not have a direction.
Let the key is free falling, therefore from equation of motion
.
Take initial velocity, u=0, so
.
![h = 0\times t + \frac{1}{2}g t^2= \frac{1}{2}gt^2 \\\ t =\sqrt{\frac{2h}{g} }](https://tex.z-dn.net/?f=h%20%3D%200%5Ctimes%20t%20%2B%20%5Cfrac%7B1%7D%7B2%7Dg%20t%5E2%3D%20%5Cfrac%7B1%7D%7B2%7Dgt%5E2%20%5C%5C%5C%20t%20%3D%5Csqrt%7B%5Cfrac%7B2h%7D%7Bg%7D%20%7D)
As velocity moves with constant velocity of 3.5 m/s, therefore we can use formula
![d= v \times t](https://tex.z-dn.net/?f=d%3D%20v%20%5Ctimes%20t)
From above substituting t,
.
Now substituting all the given values and g = 9.8 m/s^2, we get
.
Thus, the distance the boat was from the point of impact when the key was released is 10.60 m.
In what type of order are you supposed to put it in?
Answer:
D. provide the most compelling evidence of cause-and-effect relationships.
Explanation: