Answer:
 Δ T = 2.28°C
Explanation:
given,
mass of marble = 100 Kg
height of fall = 200 m
acceleration due to gravity = 9.8 m/s²
C_marble = 860 J/(kg °C)
using conservation of energy 
 Potential energy = heat energy 
    
 
    
 
    
 
    
 
         Δ T = 2.28°C
 
        
             
        
        
        
Sorry Man If you ask this question no one wants to write an essay and waste their time. You are smart enough to write an essay.
        
             
        
        
        
The age of the galaxy when we look back is 13.97 billion years.
The given parameters:
- <em>distance of the galaxy, x = 2,000 Mpc</em>
According Hubble's law the age of the universe is calculated as follows;
v = H₀x
where;
H₀ = 70 km/s/Mpc

Thus, the age of the galaxy when we look back is 13.97 billion years.
Learn more about Hubble's law here: brainly.com/question/19819028