Answer:
191.36 N/m
Explanation:
From the question,
The Potential Energy of the safe = Energy of the spring when it was compressed.
mgh = 1/2ke²............... Equation 1
Where m = mass of the safe, g = acceleration due to gravity, h = height of the save above the heavy duty spring , k = spring constant, e = compression
Making k the subject of the equation,
k =2mgh/e²................ Equation 2
Given: m = 1100 kg, h = 2.4 mm = 0.0024 m, e = 0.52 m
Constant: g = 9.8 m/s²
Substitute into equation 2
k = 2(1100)(9.8)(0.0024)/0.52²
k = 51.744/0.2704
k = 191.36 N/m
Hence the spring constant of the heavy-duty spring = 191.36 N/m
 
        
             
        
        
        
 31.3m/s
Explanation:
Given parameters: 
Mass of rock = 40kg 
Height of cliff = 50m 
Unknown: 
Speed of rock when it hits ground = ? 
Solution: 
We are going to use the appropriate motion equation to solve this problem
The rock is falling with the aid of gravitational force. The force is causing it to accelerate with an amount of velocity. 
   Using; 
                       V²  = U² + 2gH
V = unknown velocity
U = initial velocity = O
g = acceleration due to gravity = 9.8m/s²
H = height of fall
since the initial velocity of the bodyg is 0
      V²  = 2gH
     V= √2gH = √2 x 9.8 x 50 = 31.3m/s
learn more: 
Velocity brainly.com/question/4460262
#learnwithBrainly
 
        
             
        
        
        
✯Hello✯
↪  A satellite was crashed into a comet (on purpose of course)
↪  When it crashed a huge amount of water gushed out
↪  It was over hundreds of thousands of litres
↪  These proved that most of the water came from Comets for the world's first oceans
❤Gianna❤
 
        
                    
             
        
        
        
Answer:Principle of rectilinear propagation of light
Explanation:Principle of rectilinear propagation of light
Rectilinear propagation of light refers to the propensity of light to travel along a straight line without any interference in its trajectory. ... It is because light travels along a straight line and leaves only the areas where the object interferes.