Answer:
4
Explanation:
The kilogram-meter per second (kg · m/s or kg · m · s -1 ) is the standard unit of momentum . Reduced to base units in the International System of Units ( SI ), a kilogram-meter per second is the equivalent of a newton-second (N · s), which is the SI unit of impulse .
 
        
             
        
        
        
A book falls to the floor.
A car skids to a stop.
A foam ball launches from a spring (Are the right answer, just did this one 4:34 pm Jan/21/19) 
 
        
                    
             
        
        
        
Answer:
The average speed for the whole journey is 49.5 miles per hour. 
Explanation:
Step 1 : 
Here, both the ways, he covers the same distance.  Then, the formula to find average speed is
=  2xy / (x+y)
Step 2 :
x ----> Rate at which he travels from New York to Washington  
x  =  45
y ----> Rate at which he travels from New York to Washington  
y  =  55
Step 3 :
So, the average speed is
=  (2 ⋅ 45 ⋅ 55) / (45 + 55)
=  4950 / 100
=  49.5
 
        
             
        
        
        
I think it's a solar power might seem strange or futuristic but it's already quite common place you might have a solar powered quartz watch on your wrist or solar powered pocket calculator
        
                    
             
        
        
        
consider the velocity of the ball towards the wall as negative and away from the wall as positive.
m = mass of the ball = 513 g = 0.513 kg 
v₀ =  initial velocity of the ball towards the wall before collision = - 14.7 m/s 
v = final velocity of the ball away from the wall after collision = 11.3 m/s 
t = time of contact with the wall = 0.038 sec 
F = average force acting on the ball 
using impulse-change in momentum equation , average force is given as 
F = m (v - v₀)/t
inserting the values 
F = (0.513) (11.3 - (- 14.7))/0.038
F = 351 N