The first one is an opinion though the second could be too it is for sure the first
Answer:
-7.14
Explanation:
According to equation of motion
v = u + at
where
v is the final velocity at any time t
u is the initial velocity
a is the acceleration
and t is the time
___________________________________________
Given
An object is thrown upward it means
its initial velocity is in upward direction
but acceleration due to gravity is in downward direction which will cause to decrease the velocity of object.
Intial velocity u = 31.1 m/s
final velocity v at 4 second we have to find.
t = 4 second
a = g = 9.81 m/s2 (it is acting in opposite direction of motion hence its sign will be negative ).
Thus
a = - 9.81 m/s2
using the above values in v = u + at
v = 32.1 - 9.81*4
v = 32.1 - 39.24
v = -7.14
Thus, correct option is -7.14.
Some of the techniques used by astronomers to determine the type of galaxy in which we live are:
- radio,
- optical,
- infrared
- x-ray astronomy
<h3>What is Astronomy?</h3>
This refers to the study of heavenly bodies and space and other things that space is made up of.
Hence, we can see that the reason why it is so difficult to determine the shape of our galaxy is that astronomers can only infer its presence from the motions of stars in the galaxy, and a precise shape is difficult to be determined.
Read more about astronomy here:
brainly.com/question/1141458
#SPJ1
Answer:
The correct answer is "3899.92 N".
Explanation:
The given values are:
Force,
Ratio,
As we know,
Area, 
or,
⇒ 
On substituting the value of "A", we get
⇒ 
⇒ 
On applying cross-multiplication, we get
⇒ 
On substituting the given values, we get
⇒ 
⇒ 
⇒ 
I think the anwser is 3)calculus
