•
Estimate the time it takes for a free fall drop from 10 meters height. Also,
estimate the time a 10 m platform diver would be in the air if he takes off
straight up with a vertical speed of 2 m/s (and clears the platform of
course!). Please provide a brief description of how you arrived at your
estimates. (A: 18 correct
B 9 correct)
e
•
10m / 9.8m/s= 1.02s
(UNITS!);
10m / 2m/s= 5s
(RTFQ!!)
(
•
It would take about .98 seconds for the ball to fall to the
ground. The speed of the fall is 9.8 m/s.
NO!!!!!!
•
v2=v1g.t; 2m/s=0[9.8,/s^2].t;
t= 0.2 s
(wrong eqn)
(
the
answer to the question for just a free fall is 2 seconds.
•
something that is free falling, falls at an
acceleration of 9.80 m/s2 velocity is 19.6 m/s
NO, ONLY IF v=const.
•
Correct answer: 1.43 sec for A,
1.65 sec for B
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View Full Document•
Estimate the time it takes for a free fall drop from 10 meters height. Also, estimate
the time a 10 m platform diver would be in the air if he takes off straight up with a
vertical speed of 2 m/s (and clears the platform of course!). Please provide a brief
description of how you arrived at your estimates. (A: 19 correct
B 10 correct)
d
•
I found this throughusing the formula yy0= v0t0.5at^2. because this
is a free fall a=g which is 9.8m/s^2 y=10m because the fall is
downwards and we assume to start at zero for simplicity and the initial
velocity was 0, therefore,
the formula becomes 10m0=
0t.5(9.8m/s^2)t^2 t^2 = 10/4.9 which leads t=2.04s, and taking into
account sig figs becomes 2 s.
(oops SQRT missed; again carrying
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 Fall '08
 Overbye,T
 Vector Space, Velocity, Examplesâ€“ Chpt.

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