9. A construction worker accidently drops a hammer from a height of 90 m while working on the roof of a new apartment building. The height, s, in metres, of the hammer after t seconds can be modelled by the function s(t)=90–4.9t²,t>0- a. Determine the velocity at 1s and 4 s. b. When will the hammer hit the ground? c. Determine the impact velocity of the hammer.

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