# Question #6903b

##### 1 Answer

The height of the cliff is

The speed is

#### Explanation:

The equation is

The height of the cliff is when

To calculate the maximum height, we calculate the derivative

Therefore,

The speed is the derivative of the position

When

When

We solve this quadratic equation,

We neglect the negative solution

Therefore,

The speed at

graph{15+2x-x^2 [-0.17, 35.87, -0.72, 17.3]}