Answer:1.71 m/s
Explanation:
Given
mass of Susan 
Inclination 
Tension 
coefficient of Friction 
Resolving Forces Along x axis

where  
  

since there is no movement in Y direction therefore

and 
Thus 
 
                


Work done by applied Force is equal to change to kinetic Energy




 
        
 
        
             
        
        
        
Answer;
B. Fluorescent lamps operate at a higher temperature than incandescent lamps.
Explanation; 
-A fluorescent lamp, is a type of electric light (lamp) that uses ultraviolet emitted by mercury vapor to excite a phosphor, which emits visible light.
-A fluorescent lamp produces less heat, thus, it is much more efficient. A fluorescent bulb can produce between 50 and 100 lumens per watt. This makes fluorescent bulbs four to six times more efficient than incandescent bulbs.
-Fluorescent lamps operate best around room temperature. At much lower or higher temperatures, efficacy decreases.