As per the question Bob drops the bag full with feathers from the top of the building.
The mass of the bag(m)= 1.0 lb
Let the air resistance is neglected.As the bag is under free fall ,hence the only force that acts on the bag is the force of gravity which is in vertical downward direction.
Here the acceleration produced on bag due to the free fall will be nothing else except the acceleration due to gravity i.e g =9.8 m/s^2
Here we are asked to calculate the distance travelled by the bag at the instant 1.5 s 
Hence time t= 1.5 s
From equation of kinematics we know that -
                 S=ut + 0.5at^2     [ here S is the distance travelled]
For motion under free fall initial velocity (u)=0.
Hence   S= 0×1.5+{0.5×(-9.8)×(1.5)^2}
            ⇒ -S =0-11.025 m
             ⇒ S= 11.025 m
                    =11 m
Here the negative sign is taken only due to the vertical downward motion of the body .we may take is positive depending on our frame of reference .
Hence the correct option is B.
                 
 
        
                    
             
        
        
        
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Most often those smaller structures are triangular in shape because triangular shapes are very strong and stable 
 
        
                    
             
        
        
        
Answer:
Explanation:
As the sum of the two right directed forces match exactly the left directed force, the only unbalanced force, and thus the net force, is the upward 25 N force.
 
        
             
        
        
        
Answer:
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