Pretty sure its volcanic ash or magma, hope this helps
        
             
        
        
        
Answer:
d = 105 m
Explanation:
Speed of a car, v = 21 m/s
We need to find the distance traveled by the dar during those 5 s before it stops. Let the distance is d. It can be calculated as :
d = v × t
d = 21 m/s × 5 s
d = 105 m
So, it will cover 105 m before it stops.
 
        
             
        
        
        
Answer:
C. Car A
Explanation:
if the answer is: which roller coaster car has the greatest potential energy due to gravity brainly
 
        
             
        
        
        
Answer:
a)  Initial angular speed = 30 rad/s
b) Final angular speed = 70 rad/s         
Explanation:
a) We have equation of motion s = ut + 0.5at²
     Here s = 400 radians
               t = 8 s
               a = 5 rad/s²
     Substituting
              400 = u x 8 + 0.5 x 5 x 8²
               u = 30 rad/s
    Initial angular speed = 30 rad/s
b) We have equation of motion v = u + at
      Here u = 30 rad/s
                t = 8 s
               a = 5 rad/s²   
     Substituting
              v = 30 + 5 x 8 = 70 rad/s    
    Final angular speed = 70 rad/s