Answer:
time taken to reach maximum height is 2.548 sec and Maximum height is 31.855 m
Step-by-step explanation:
Initial velocity U= 25 m/s 
at maximum height velocity, V= 0 m/s 
 Let the time taken to reach maximum height be t and maximum height be H. 
 V= U-gt 
 so 25-9.81.t=0 
 therefore t= 25/9.81 = 2.548 sec 
 Now, 
 H= Ut-1/2(gt^2) 
 =25x2.548-0.5x9.81x(2.548^2) 
 =31.855 m
  Thank you