A projectile is projected from the ground with speed 20 m/s at an angle 60° above the horizontal. Neglect air resistance and take g = 10 m/s². The radius of curvature of its trajectory at the highest point is:
Options

Question

A projectile is projected from the ground with speed 20 m/s at an angle 60° above the horizontal. Neglect air resistance and take g = 10 m/s². The radius of curvature of its trajectory at the highest point is:

Options

G1 Physics · Accepted Answer

At the highest point, velocity is horizontal with magnitude v = ucos60° = 10 m/s, while acceleration g is perpendicular to velocity. Radius of curvature ρ = v²/aₙ = 10²/10 = 10 m. Therefore option B is correct.