Question

Neglecting air resistance-what does the assumption really mean?​

Answer 1

An alternative hypothesis is that the force due to air resistance is proportional to the square of the speed...this might be more reasonable, for example, at very high speeds. But we will stick with the linear assumption. This linear hypothesis means that there is a positive constant k such that...... ☺☺☺☺☺☺☺

Answer 2

The vertical velocity will accelerate because there is a force of gravity changing the velocity in the vertical plane. ... There are no forces acting on a projectile in the horizontal direction (neglecting air resistance), therefore the velocity is constant