# Velocity, time, position

###### Question:

A stone is thrown from the top of a building with initial veocity of 20 m/s upwards. The building is 50 m. high and the stone just misses the edge of the roof on itsway down. Determine:
(a) The time needed for the stone to reach its maximum height?
(b) The position and velocity of the stone at t=5 seconds?

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