Answer:
the mass of the body is 0.02 kg.
Explanation:
Given;
relative density of the oil,  = 0.875
 = 0.875
mass of the object in oil,  = 0.013 kg
 = 0.013 kg
mass of the object in water,  = 0.012 kg
 = 0.012 kg
let the mass of the object in air = 
weight of the oil, 
weight of the water, 
The relative density of the oil is given as;

Therefore, the mass of the body is 0.02 kg.
 
        
             
        
        
        
Answer:
The initial speed of the pelican is 8.81 m/s.
Explanation:
Given;
height of the pelican, h = 5.0 m
horizontal distance, X = 8.9 m
The time of flight is given by;

The initial horizontal speed of the pelican is given by;
X = vₓt
vₓ = X / t
vₓ = 8.9 / 1.01
vₓ = 8.81 m/s
Therefore, the initial speed of the pelican is 8.81 m/s.
 
        
             
        
        
        
Explanation:
everything can be found in the picture