D. diamond, is the best option..
        
                    
             
        
        
        
Answer:
 15m/s²
Explanation:
Given parameters: 
Initial velocity  = 10m/s 
Final velocity  = 40m/s 
Time taken  = 2s 
Unknown: 
Average acceleration  = ? 
Solution: 
Acceleration is the rate of change of velocity with time; 
  Acceleration  =  
   
   Acceleration =  = 15m/s²
    = 15m/s²
 
        
             
        
        
        
Answer:
0.66
Explanation:
By using the formula 
u = v^2 / r g
Where u is coefficent of friction
u = 23.5 × 23.5 / (85 × 9.8)
u = 0.66
 
        
             
        
        
        
The correct answer to this is (A. Units Only).
It shows that there is a velocity of 35, but the units are missing.
        
             
        
        
        
Answer:
Stress = F / A       force per unit area
A = 3.00 cm^2 = 3 E-4  m^2
F = 2.4E8 N/m^2 * 3E-4 m^2 = 7.2E4 N    max force applied
F/3 = 2.4E4 N  if force not to exceed limit   (= f)
f = M a 
a = 2.4 E4 N / 1.2 E3 kg = 20 m / s^2      about 2 g