Answers

2015-08-17T17:08:30+05:30
The initial upward velocity is given as 49 m/s
the final velocity at maximum height will be zero.
v = u + at
here 
v=0
u = 49 m/s
a = -9.8 m/s^2

0= 49 - 9.8t
t = 49/9.8 = 5 seconds.
it takes 5 seconds to rise.

and similarly while falling, it takes 5 seconds.
so total time is 10seconds
0