Answer:
Explanation:
The given time is 1 / 4 of the time period 
So Time period  of oscillation.
= 4 x .4 =1.6 s 
When the block reaches back its original position when it came in contact with the spring for the first time , the block and the spring will have maximum 
velocity. After that spring starts unstretching , reducing its speed , so block loses contact as its velocity is not reduced . 
 So required velocity is the maximum velocity of the block while remaining in contact with the spring.
v ( max ) = w A = 1.32  m /s.
 
        
             
        
        
        
Answer:
the answer is 12 because if your magnetic value and Electric field is 3.2 the answer will be 12
 
        
             
        
        
        
Answer:
This is because the air outside is always cooler than the air inside, so after staying outside your body adapts to the cold air, when you come back inside, the cold air is still in you which makes the room seem warmer.
 
        
             
        
        
        
Black hole, it sucks in pretty much everything in its path