Answer:
An object's acceleration is the rate its velocity (speed and direction) changes. Therefore, an object can accelerate even if its speed is constant - if its direction changes.
Explanation:
 
        
             
        
        
        
P1v1/t1 = p2v2/t2 
p1=p2, v1=.2, t1=333, t2=533
we can find v2 from this 
be aware, temperature must be in Kelvin.
        
             
        
        
        
When calculated energy transferred between objects use the definition of heat as
 
        
             
        
        
        
Let the key is free falling, therefore from equation of motion
 .
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Take initial velocity, u=0, so 
 .
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As velocity moves with constant velocity of 3.5 m/s, therefore we can use formula

From above substituting t,
 .
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Now substituting all the given values and g = 9.8 m/s^2, we get 
 .
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Thus, the distance the boat was from the point of impact when the key was released is 10.60 m.
 
        
             
        
        
        
Answer:
1.4m/s
Explanation:
Average velocity is the total distance covered divided by the total time taken. 
  Average velocity  =  
   
  Total time taken  = 5s + 6s  = 11s 
The first distance covered  = velocity x time  = 1.4 x 5 = 7m 
      second distance covered  = velocity x time  = 1.4 x 6  = 8.4m 
So;
   Average velocity  =  = 1.4m/s
    = 1.4m/s