Answer:
Explanation:
Solution is in the picture attached 
 
        
             
        
        
        
5.5 s
Explanation:
The time it takes for the ball to reach its maximum height can be calculated using

since  at the top of its trajectory. Plugging in the numbers,
 at the top of its trajectory. Plugging in the numbers,

 
        
             
        
        
        
Since force = mass X acceleration, then the force he excerts on the earth (aka his weight) equals his mass times the force of gravity. 
Therefore 
W = (66 kg) X (9.8 m/ss) 
W = 646.8 kgm/ss 
kg m/ss are also known as Newtons, so your answer is... 
646.8 N
        
             
        
        
        
Answer:
Ships can float because a ship is less dense than that of the water that it floats on.
Explanation:
Hope this helps!
 
        
             
        
        
        
0.33 . Equation is Force of friction equals normal force times coefficient of friction, so 6=18u. Divide 6 by 18