How do I find the rate?

Jill

New member
A diver is on the 10 m pltform, preparing to perform a dive. The diver's height above the water,n metres, at time "t" can be modelled using the equation h(t) = 10 + 2t - 4.9t^2

Estimate the rate at which the diver's height above the water is changing as the diver enters the water.

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The answer is 14 m/s, but I don't know how to arrive at that solution.
Could someone kindly step me through the process?
 
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