Answer:
False 
Explanation:
 Because when you go through east
 ( +x axis ) then you go to west ( -x axis )
 You will subtract -9 from +15 
it's become +6
 ( I talk about the displacement not distance) ( West = - East ) 
I hope that it's a clear ") .
 
        
                    
             
        
        
        
Answer:
a)Velocity of car =v=16 m/s
b)Force against the track at point B=1.15* N
N 
Explanation:
Given mass of roller coaster=m=350 kg
Position of A=Ha=25 m
Position of B=Hb=12 m
Net potential energy=mg(ha-hb)
Net potential energy=(350)(9.80)(25-12)
Net potential energy=44590 J
Using energy conservation
net kinetic energy=net potential energy
(1/2)mv^2=mg(ha-hb)
m=350
velocity=v=16 m/s
b)There two force acting,centripetal force upward and gravity downward.
Thus net force acting will be 
Net force=(mv^2/r)-mg
Net force=14933.33-3430
Net force=1.15* N
 N
 
        
                    
             
        
        
        
Before the engines fail  , the rocket's horizontal and vertical position in the air are
, the rocket's horizontal and vertical position in the air are


and its velocity vector has components


After  , its position is
, its position is


and the rocket's velocity vector has horizontal and vertical components


After the engine failure  , the rocket is in freefall and its position is given by
, the rocket is in freefall and its position is given by


and its velocity vector's components are


where we take  .
.
a. The maximum altitude occurs at the point during which  :
:

At this point, the rocket has an altitude of

b. The rocket will eventually fall to the ground at some point after its engines fail. We solve  for
 for  , then add 3 seconds to this time:
, then add 3 seconds to this time:

So the rocket stays in the air for a total of  .
.
c. After the engine failure, the rocket traveled for about 34.6 seconds, so we evalute  for this time
 for this time  :
:

 
        
             
        
        
        
Answer:
4.2 is the answer
Explanation
The image formed in a plane mirror is an equal distance behind the mirror as the object in front of it.
Step 1: the equation to this problem would be: 8.4/2
Step 2: 8.4 ÷ 2 = 4.2
 
        
             
        
        
        
Weight  = Mass * gravity
             =  1470* 9.8 = 14406 N  ≈ 14,400 N