Explanation:
It is given that,
Mass of person, m = 70 kg
Radius of merry go round, r = 2.9 m
The moment of inertia, 
Initial angular velocity of the platform, 
Part A,
Let  is the angular velocity when the person reaches the edge. We need to find it. It can be calculated using the conservation of angular momentum as :
 is the angular velocity when the person reaches the edge. We need to find it. It can be calculated using the conservation of angular momentum as :

Here, 


Solving the above equation, we get the value as :

Part B,
The initial rotational kinetic energy is given by :



The final rotational kinetic energy is given by :



Hence, this is the required solution.
 
        
             
        
        
        
Answer:
A model rocket is launched with an initial upward velocity of 215 ft/s.
Explanation:
 
        
             
        
        
        
Answer:
The speed of the boxes are 1 m/s.
Explanation:
Given that,
Mass of box = 1 kg
Mass of another box = 2 kg
Suppose 1 kg box moves with 3 m/s speed.
We need to calculate the speed of the boxes
Using formula of conservation of momentum

Where, u = initial velocity
v = final velocity
Put the value into the formula



Hence, The speed of the boxes are 1 m/s.
 
        
             
        
        
        
Tectonic plates interactions are of three different basic types: Divergent boundaries are areas where plates move away from each other, forming either mid-oceanic ridges or rift valleys. <span />
        
             
        
        
        
Between centre of curvature and principal focus.