Question #26ccf
1 Answer
Aug 2, 2016
Explanation:
Kinematic equation for free fall under gravity is given by

Height of
#9th# storeys of the building#h# , is found by inserting given values
#h=0xx3+1/2xx10xx3^2 =45 m#
Height of each storey#=45/9=5m# 
Height dropped in first second is
#h_1=0xx3+1/2xx10xx1^2 =5 m# 
Now height dropped in first second
#5m#
#=nxx"height of each storey"#
#=>n=1#