# A diver dives into the sea from a height of 35m. His height h meters t seconds after leaving the cliff is given by #h = -4.9² + t + 35#. How long until he reaches the water?

##### 1 Answer

Jul 28, 2016

2.67 seconds

#### Explanation:

The diver starts at the height of 35 metres. At the point of impact with the water his height is 0.

As I understand things

Acceleration will be 9.81 metres per second squared

So height will be starting distance -( mean velocity times time)

mean velocity

So height

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Standard equation is

so