We know that the initial velocity is #0# #m/s#.Time taken to touch the ground is #5# #sec#. The acceleration due to gravity is #9.8# #m/s#. For easier calculation, lets assume it to be #10# #m/s#

We use the kinematic equation

#color(blue)(s=ut+1/2at^2#

Where,

#s# is the distance travelled (in metres), #u# is the initial velocity, #a# is the acceleration and #t# is the time taken

Plugin the values

#rarrs=ut+1/2at^2#

#rarrs=(0)(5)+1/2*10*5^2#

#rarrs=1/cancel2^1*cancel10^5*25#

#rarrs=5*25#

#color(green)(rArrs~~125# #color(green)(m#

Hope that helps!!!☺○☻