I need help with the question: a diver is on the 10 m platform; the diver's height above the water, in metres, at timetcan 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.

I know that the time that the diver hits the water is around 1.65 seconds and I tried to find the average rate of change between 0 seconds and 1.65 seconds, but the rate that I calculated was around -6 m/s.

I know that the correct answer is about 14 m/s but I'm not sure how to solve for this answer.

Any suggestions would be appreciated, please and thank you!