A body is projected horizontally from the top of a tower with initial velocity 18 ms⁻¹. It hits the ground at angle 45° with horizontal. What is the vertical component of velocity when the body strikes the ground?
Options

Question

A body is projected horizontally from the top of a tower with initial velocity 18 ms⁻¹. It hits the ground at angle 45° with horizontal. What is the vertical component of velocity when the body strikes the ground?

Options

G1 Physics · Accepted Answer

The horizontal component remains 18 m/s. At impact the velocity makes 45° with the horizontal, so |vᵧ|/vₓ = tan45° = 1. Therefore |vᵧ| = 18 m/s. Hence option B.