1.1. A stuntperson rides a bicycle off a straight ramp inclined 30° to the horizontal at the end of a pier.  

The bicycle leaves the ramp with a speed of $14m{s}^{-1}$.

The bicycle and stuntperson are modelled as a single particle and land in the water at a horizontal distance of $28m$ from the end of the pier.

Calculate the time (in seconds) for which the stuntperson and bicycle are in the air above the water.

1.2. Given that the end of the ramp was 50 cm above the pier, find the height of the pier, giving your answer to the nearest tenth of a metre.