Answer:
The gravitational acceleration of the planet is, g = 8 m/s²
Explanation:
Given data,
The distance the object falls, s = 144 m
The time taken by the object is, t = 6 s
Using the III equations of motion
                   S = ut + ½ gt²
∴                 g = 2S/t²
Substituting the given values,
                    g = 2 x 144 /6²
                       = 8 m/s² 
Hence, the gravitational acceleration of the planet is, g = 8 m/s² 
 
        
             
        
        
        
Answer: The spring constant is K=392.4N/m
Explanation:
According to hook's law the	applied force F will be directly proportional to the extension e produced provided the spring is not distorted 
The force F=ke
Where k=spring constant 
 e= Extention produced 
 h=2m
Given that 
e=20cm to meter 20/100= 0.2m
m=100g to kg m=100/1000= 0.1kg
But F=mg
Ignoring air resistance 
assuming g=9.81m/s² 
Since the compression causes the plastic ball to poses potential energy hence energy stored in the spring 
E=1/2ke²=mgh
Substituting our values to find k
First we make k subject of formula
k=2mgh/e²
k=2*0.1*9.81*2/0.1²
K=3.921/0.01
K=392.4N/m
 
        
             
        
        
        
Answer:
Gravity, Friction, Air resistance, magnetism, static electricity
Explanation:
 
        
                    
             
        
        
        
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