An object is falling towards the ground according to the equation h(t) = 245 - 5t2 where t is measured in seconds and h(t) is measured in metres. The velocity of the object at t = 4 seconds is   (a) 0 m/s (b) -40 m/s (c) Not enough information is given to be able to find the instantaneous velocity (d) 40 m/s

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