Question

Why does the direction of motion of a projectile become horizontal at the height point of its trajectory?

Answer 1

For a particle in projectile motion, the velocity can be seen as a resultant of velocities in two directions, forward (horizontal) and up (vertical). As the particle is always being pulled down by the force of gravity, it continues losing the upward velocity to the point where it becomes zero and then becomes negative from the point the particle starts coming downwards. At the highest point, when upward velocity is zero, the particle only has forward velocity hence the direction of resultant velocity is also forward (or horizontal).



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Answer 2

because at the highest point the vertical velocity becomes 0 due to the acceleration due to gravity which acts opposite to the direction of the vertical velocity till the body ascends while on the other hand the horizontal velocity remains unaffected dur to gravity.

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