A body dropped from top of a tower fall through 40 
during the last two seconds of its fall. The height of tower is 
A
60 
B
45 
C
80 
D
50 
Text Solution
Verified by ExpertsThe correct answer is:
B
Let 
be height of the tower and 
is the time taken by the body to reach the ground.
Here, 
or 
or 
(i)
Distance covered in last two seconds is
Here, 
or 
or 
or 
From eqn (i), we get 
or 
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