Question

please answer fastly with correct answer i will make him brainlist​

Answer 1

Answer:

(a) velocity = 30m/s

(b) time= 3s

Answer 2

Answer:

a) 2gh= v^2 - u^2

    2 * -10 * 45 = 0 - u^2

     -900 = - u^2

     u = 30 m/s

b) v= u+ gt

   0 = 30 + (-10)t

   t= 3s <-- it will not be -3s as time cannot be negative

c) since, time of ascent=time of descent = 3s

    so, total time in air = time of ascent + time of descent  

                                   = 3+3=6s