Answer:
The  time elapsed at the spacecraft’s frame is less that the time elapsed at earth's  frame 
Explanation:
From the question we are told that 
The distance between earth and Retah is  
Here c is the peed of light with value 
 The time taken to reach Retah from earth is  
 The velocity of the spacecraft is mathematically evaluated  as 
      
substituting values 
    
     
The time elapsed in the spacecraft’s frame is mathematically evaluated as 
       
substituting value 
        ![T  =  90000 *  \sqrt{ 1 -  \frac{[2.4*10^{8}]^2}{[3.0*10^{8}]^2} }](https://tex.z-dn.net/?f=T%20%20%3D%20%2090000%20%2A%20%20%5Csqrt%7B%201%20-%20%20%5Cfrac%7B%5B2.4%2A10%5E%7B8%7D%5D%5E2%7D%7B%5B3.0%2A10%5E%7B8%7D%5D%5E2%7D%20%7D)
         
=>    
So  The  time elapsed at the spacecraft’s frame is less that the time elapsed at earth's  frame 
         
 
        
             
        
        
        
Baseball is known as americas past time
        
                    
             
        
        
        
Explanation:
Work done is the force applied to move a body through a specific or particular direction. 
It is also the difference in the amount of energy expended in using an effort. 
  Work done is given as;
  Work done  = F x d CosФ 
F is the force applied 
d is the displacement
Ф is the angle 
  The unit of work done is in Joules. 
 
        
             
        
        
        
Answer:bowling ball has greater kinetic energy 
Explanation:
Kinetic energy of bowling ball:
mass=m=5kg
Velocity=v=6m/s
Kinetic energy =ke
Ke=0.5 x m x v x v
Ke=0.5 x 5 x 6 x 6
Ke=90J
Kinetic energy of ship:
mass=m=120000kg
velocity=v=0.02m/s
Ke=0.5 x m x v x v 
Ke=0.5 x 120000 x 0.02 x 0.02
Ke=24J
 
        
             
        
        
        
Explanation: Formulas you need to use:
K=0.5mass(Velocity^2)
km/h / 3.6 ===>M/S
Step 1:
convert km/h to m/s
Put the values in the formula :