Question

A bl whose kinetic energy is E is projected at an angle 45degrees to the horizontal. Find the kinetic energy of the ball the higest point of its flight.

Answer 1

E/2. let the initial velocity at angle 45 be v. at the highest point vertical component of velocity will be zero and constant horizontal component 0.707 v resulting in k.e. = E/2 bcz E=1/2 mv^2 at the beginning