An object with a mass of 90 grams, moving at a constant velocity of 6 meters per second, has

It has a 0.54N weight or force of weight

To solve this given word problem we can first identify the given and the apt formula to use in this phenomenon: Given: Force = 4, 500 N = 4, 500 kg-m/s^2 Acceleration = 5 m/s^2   
Formula: f=ma 
Derivation: m = f/a 
Solution: 
1.    M = f/a 
2.    M = 4,500 kg-m/s^2 / 5 m/s^2 
3.    M = 900 kg   

Hence, the object’s mass is 900 kg. 

Idon’t really understand your questions

Perform surgeries is the correct answer.