is equal to its final horizontal velocity
bez both upward and downward motions are identical in presence of single force called gravitational force which acts in y axis direction and horizontal velocity is in x axis so net force on horizontal velocity is zero 
 
        
             
        
        
        
Physical changes are those change which just externally or physically change the state of the object . for example : water boils and evaporates... here the state is just changing from liquid to vapour while the composition is the same.
chemical changes are those which bring about a change in the composition of a substance. for example: burning of paper changes into ash .
        
                    
             
        
        
        
Answer:
ω = 0.571 rad/s
Explanation:
given data 
radius = 30 m 
solution 
we take here g = 9.8 m/s²
and g is express as 
g = r × ω²     ....................1 
put here value and we get 
9.8 = 30 × ω² 
solve it we get 
ω = 0.571 rad/s
 
        
             
        
        
        
Answer:
an elevator stopped on the third floor a basketball shot into a hoop a sled sliding down a snowy hill a tow truck pulling a car out of a ditch