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Physics 125
Discussion #3
1
Problem 1: A freelyfalling coin
A oneeuro coin is dropped from the Leaning Tower of Pisa. It starts from rest and falls
freely.
(3) What is the coin’s position y at an arbitrary time t?
(4) Compute the coin’s position after 2.0 s.
(5) What is the coin’s velocity v
y
at an arbitrary time t?
(6) Compute the coin’s velocity after 2.0 s.
(1)
Define your coordinate system. Remember to mark the
origin
O
.
(2)
Let’s list the known factors:
a.
initial position: y
0
= _____________
b.
initial velocity: v
0
= _____________
c.
acceleration: g = ____________
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View Full DocumentPhysics 125
Discussion #3
2
Problem 2: Up and Down Motion in Free Fall
You throw a ball vertically upward from the roof of a tall building. The ball leaves your
hand at a point even with the roof railing with an upward speed of 15.0 m/s; the ball is
then in free fall. On its way back down, it just misses the railing.
(3) Find the position and velocity of the ball 1.00 s after leaving your hand.
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 Fall '08
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 Physics

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