The formula for impulse is F*(t₂-t₁)=m*(v₂-v₁), where F is the force, t is time, m is mass and v is velocity. 
In our case m*(v₂-v₁)=16 N s, m=4 kg, v₁=0 and t₁=0.
m*(v₂-0)=16 N s, we solve for v₂:
4*v₂= 16
v₂=16/4
v₂=4 m/s
So the final velocity of the ball is v₂=4 m/s.
        
             
        
        
        
Answer:
W'=125.44 N
Explanation:
The weight of a person on the surface of Earth is 784 N
Weight is given by :
W = mg
m is mass of the person and g is acceleration due to gravity on the surface of Earth (10 m/s²)

The acceleration due to gravity on the surface of Moon, g' = 1.6 m/s²
Weight of the person on the moon is :
W'=mg'

Hence, the person would weigh 125.44 N on the Moon.
 
        
             
        
        
        
100 watts = 100 joules per second
22 watts  =  22 joules per second
Saving  =  78 joules per second
1 hour = 3,600 seconds
24 hours = 86,400 seconds
     (78 joules/sec) x (86,400 sec)  =  6,739,200 joules
        
             
        
        
        
Answer:
hot
Explanation:
cause the room temperature is higher