False: because atoms are base on the elements on the periodic table.
        
             
        
        
        
The vector sum of forces acting on a non-accelerating object equals zero.
equation form: ΣF = 0
        
                    
             
        
        
        
Answer:
θ = 13.16 °
Explanation:
Lets take mass of child = m
Initial velocity ,u= 1.1 m/s
Final velocity ,v=3.7 m/s
d= 22.5 m
The force due to gravity along the incline plane = m g sinθ
The friction force = (m g)/5
Now from work power energy
We know that
 work done by all forces = change in kinetic energy
( m g sinθ - (m g)/5 ) d = 1/2 m v² - 1/2 m u²
(2  g sinθ - ( 2 g)/5 ) d = v² -  u²
take g = 10 m/s²
(20 sinθ - ( 20)/5 ) 22.5 = 3.7² -  1.1²
20 sinθ - 4 =12.48/22.5
θ = 13.16 °