Answer:
2420 J
Explanation:
From the question given above, the following data were obtained:
Force (F) = 22.9 N
Angle (θ) = 35°
Distance (d) = 129 m
Workdone (Wd) =? 
The work done can be obtained by using the following formula:
Wd = Fd × Cos θ
Wd = 22.9 × 129 × Cos 35
Wd = 22.9 × 129 × 0.8192
Wd ≈ 2420 J
Thus, the workdone is 2420 J. 
 
        
             
        
        
        
Answer:
Explanation:
Spring has a tendency to store energy in them and deform its shape when force is applied on it. Once the applied force is removed it regains its original shape and size.
It is in helical shape and is used in mattress to give structure and support. Spring have elastic nature and follows spring forces, F = k * x
where is the applied force, k is the spring constant and x is the amount of extension.
When a heavier person sits on a mattress, more weight is applied on springs and they form coils, as weight is removed they regains its shape again.
 
        
             
        
        
        
Half mass car because it's traveling faster
        
                    
             
        
        
        
The distance an object falls from rest through gravity is
                         D  =  (1/2) (g) (t²)
            Distance  =  (1/2 acceleration of gravity) x (square of the falling time)
We want to see how the time will be affected 
if  ' D ' doesn't change but ' g ' does. 
So I'm going to start by rearranging the equation
to solve for ' t '.
                                                      D  =  (1/2) (g) (t²)
Multiply each side by  2 :         2 D  =            g    t²  
Divide each side by ' g ' :      2 D/g =                  t² 
Square root each side:        t = √ (2D/g)
Looking at the equation now, we can see what happens 
to ' t ' when only ' g ' changes:  
-- ' g ' is in the denominator; so bigger 'g' ==> shorter 't'
                                             and smaller 'g' ==> longer 't' .
-- They don't change by the same factor, because  1/g  is inside
the square root.  So 't' changes the same amount as  √1/g  does.
Gravity on the surface of the moon is roughly  1/6  the value
of gravity on the surface of the Earth.
So we expect ' t ' to increase by  √6  =  2.45 times.
It would take the same bottle  (2.45 x 4.95) = 12.12 seconds
to roll off the same window sill and fall 120 meters down to the
surface of the Moon.