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Find height of building after a rock and a marble are thrown downward.

From a rooftop, a rock is released at rest and 2 seconds later, a marble is thrown downward from the roof with initial speed of 24.5 m/sec. Both hit the ground at the same instant.

Find the height of the building.

Solution Preview

Let H = the height of the building and t the flight time for the marble. For the rock, y(t) is:

(1) H= .5 g t^2
For the ...

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with clear explanations, the problem are solved showing the calculations.

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