*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆**☆*――*☆*――*☆*――*☆
Answer: Something that's vibrating, and you also need medium for those vibrations to start in.
I hope this helped!
<!> Brainliest is appreciated! <!>
- Zack Slocum
*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆*――*☆**☆*――*☆*――*☆*――*☆
<span>Let equation A be
h=ut+<span>12</span>g<span>t2 </span></span>
for 1st stone:
<span>h=<span>12</span> g<span>t2
</span></span>eq.-(A)
for 2nd stone:
<span>h=32m/s(t−1.6s)+<span>12</span>g(t−1.6s<span>)2
</span></span><span>h=32m/s∗t−51.5m+<span>12</span>g<span>t2</span>+12.544m−15.68m/s∗t
</span>
<span>h=16.32m/s∗t+h−38.656m
</span>
<span>t=2.3686s
</span>
now putting the value of t in eqn. A
<span><span>h=27.49m</span></span>
..... equal to the force from the engine pushing the car forward.
That's why the car is not accelerating. The horizontal forces on it
are balanced.
For this case, in the next item we have gravitational potential energy:
An apple in a tree.
Suppose we define our reference system at the floor level.
Suppose the apple is at a height h from the floor and has mass m.
The gravitational potential energy of the apple is given by:
U = mgh
Where,
m: apple mass
h: height of the apple with respect to the floor
g: acceleration due to gravity
Answer:
C) an apple on a tree
