A projectile is launched upward from level ground. It starts with an initial velocity of $20\,\text{m s}^{-1}$ at an angle of $45^{\circ}$ to the horizontal. Air resistance is negligible. Which statement gives the speed of the object from the moment it is fired until just before it lands on the ground again?
- AIts speed decreases to a value greater than zero, then increases to $20\,\text{m s}^{-1}$.
- BIts speed decreases to a value greater than zero, then increases to a value greater than $20\,\text{m s}^{-1}$.
- CIts speed decreases to zero, then increases to $20\,\text{m s}^{-1}$.
- DIts speed decreases to zero, then increases to a value less than $20\,\text{m s}^{-1}$.