The velocity of projection of the bag is
The angle of projection of the suitcase is
Initial vertical component of the velocity(upward)
The vertical displacement of the bag ,
Acceleration due to gravity
" since upward initial vertical component of velocity taken +ve"
The horizontal component of the velocity
Let the time required for its landing after it is thrown is T sec
So applying equation of motion under gravity we can write
Horizontal displacent of suitcase during this time of fall is
So the suitcase will land at a distance of 793m from the dog.