Question

why does the direction of motion of projectile become horizontal at the highest 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).

Answer 2

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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