Question

Kinetic energy of a particle at it's maximum height is half of it's initial kinetic energy then the angle of throw with the vertical is

Answer 1

Answer:

45 degrees

Explanation:

At max height all kinetic energy is all in the perpendicular directions of gravity. Thus the parallel must be equal to the perpendicular initially for it to be halfed. That implies the parallel speed is the same as the perpendicular initially. A symmetry only possible if the angle of launch was 45 degrees.

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