Answer:

Explanation:
Using the conservation of energy we have:

Let's solve it for v:

So the speed at the lowest point is 
Now, using the conservation of momentum we have:

 
 
Therefore the speed of the block after the collision is 
I hope it helps you!
         
 
        
             
        
        
        
Answer:
2 m/s^2, west
Explanation:
Vf=final velcoity
Vi=initial velocity 
t=timw

=

= - 2 m/s^2
The - changes direction and makes it opposite
2 m/s, west
 
        
             
        
        
        
Neglecting friction and air resistance, the first hill must be built 4 times higher than it is now.
        
             
        
        
        
Answer:

Explanation:
As we know that the satellite revolves around the planet then the centripetal force for the satellite is due to gravitational attraction force of the planet
So here we will have

here we have


here we have

now we can find time period as




Now the density is given as


