A projectile is fired at $45^\circ$ above the horizontal with initial kinetic energy $E$. If air resistance is taken to be negligible, what is the kinetic energy of the projectile at its maximum height?
- A$0.50E$
- B$0.71E$
- C$0.87E$
- D$E$
Physics 9702 · AS & A Level · Gravitational potential energy and kinetic energy