You told your insane friend that it will take the book 5.6 s to get to the ground.
From the question given above, the following data were obtained:
Height (H) = 155 m
<h3>Time (t) =? </h3>
<u>NOTE</u>: Acceleration due to gravity (g) = 10 m/s²
The time taken for the book to get to ground can be obtained as follow:
<h3>H = ½gt²</h3>
155 = ½ × 10 × t²
155 = 5 × t²
<h3>Divide both side by 5</h3>

t² = 31
<h3>Take the square root of both side </h3>

<h3>t = 5.6 s</h3>
Thus, the time taken for the book to get to the ground is 5.6 s
Hence, you told your insane friend that it will take the book 5.6 s to get to the ground.
Learn more: brainly.com/question/24903556
Answer:
1. 
2. 
3. 
Explanation:
Use conservation of momentum:


1.
The expression for the magnitude of the BB's velocity is
v2i = 0 m/s, solve for v1f

2.
Now replacing numeric to find the value


3.
Now is doesn't exist the box the velocity will be
v1f = v2f = vf
Conservation of Momentum





Answer:Light (electromagnetic) energy does not require a medium through which to travel.
Explanation:
Electromagnetic waves doesnt need to medium for travell
Ex ; Ultra violet rays , X rays
Sound waves needs to medium to travell but electromagnetic waves doesnt
Electromagnetic waves are constructed due to perpendicular electric field and magnetic field
Application of electromagnetic waves
Visible rays helps to see anything
IR rays is used in medical industry for cancer treatment
Answer:
(iii) > (ii) > (iv) > (i)
Explanation:
Part (i):

Part (ii):

Part (iii):

Part (iv):

From the above calculations, we have

So, the speed in the parts mentioned arranged in decreasing order as follow:
(iii) > (ii) > (iv) > (i)