In Exercises 2124, an object is thrown upward,dropped, or thrown downward and travels in
Chapter 2, Problem 21(choose chapter or problem)
In Exercises 2124, an object is thrown upward,dropped, or thrown downward and travels in a verticalline subject only to gravity with wind resistanceignored. The height h, in feet, of the object above theground after t seconds is given bywhere is the initial height of the object at startingtime and is the initial velocity (speed) of theobject at time The value of is taken as posi-tive if the object starts moving upward at timeand negative if the object starts moving downward atAn object that is dropped (rather than throwndownward) has initial velocityHow long does it take an object to reach theground in each case?a. It is dropped from the top of a 640-foot-highbuilding.v0 0.b. It is thrown downward from the top of thesame building, with an initial velocity of 52 feetper second.
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