A projectile is projected at an angle of $45^\circ$ above the horizontal and has initial kinetic energy $E$. If air resistance is taken to be negligible, what is the projectile’s kinetic energy at its greatest height?
- A$0.50E$
- B$0.71E$
- C$0.87E$
- D$E$
Physics 9702 · AS & A Level · Energy conservation