Our friend, Superman, standing at the base of a skyscraper, which is 875 feet tall, sees Lois Lane dangling precariously off the edge of the top of the building. If he leaps upward with acceleration of a(t)=12t^2+20 ft/sec^2, what is Superman's speed when he saves Lois? (hint 875=5^4+10*5^2). Upload

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