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(a) Define time of flight and horizontal range? (b) From a certain height above the ground a stone A is dropped gently. Simultaneously another stone B is fired horizontally. Which of the two stones will arrive on the ground earlier?  

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(a) Time of flight – The time taken by the projectile to complete its trajectory is called time of flight. 

Horizontal Range – The maximum horizontal distance covered by the projectile form the foot of the tower to the point where projectile hits the ground is called horizontal range. 

(b) Both the stones will reach the ground simultaneously because the initial vertical velocity in both cases is zero and both are falling with same acceleration equal to acceleration due to gravity. 

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