At a harbour enemy ship is at a distance 
m from the security cannon having a muzzle velocity of 60 m/s
Text Solution
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For hitting the ship the range of cannon must be equal to the distance of ship from cannot i.e.,
Range 
r 
The cannot mist be elevated at an angle of 
or 
As 
, depending on 
there are two times of flight which are given by
and 
.
The maximum range of cannot (where 
)
And as initially the ship is 
, so to become out of maximum range of cannot, the ship should be moved away form the harbour form its initial position by at least 
.
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