Answer:
t should be 3.57 second
Explanation:
Formula used is v = u+at 
In which v is final velocity, u is initial velocity, a is acceleration and t is time. 
Substitute each of the info given into the formula and calculate. 
49 = 24 + (7)t
t = 3.57s
 
        
             
        
        
        
It’s doesn’t change meaning it’s 0