PHYSICS QUESTION PLEASE HELP ME

Physics
Tutor: None Selected Time limit: 1 Day

If skier  has a vertical leap of 1.29 m, then what is his takeoff speed and his hang time?

Apr 7th, 2015

Given:

a = -9.8 m/s2

vf = 0 m/s

d = 1.29 m

Find:

vi = ??

t = ??

vf2 = vi2 + 2*a*d

(0 m/s)2 = vi2 + 2*(-9.8 m/s2)*(1.29 m)

0 m2/s2 = vi2 - 25.28 m2/s2

25.28 m2/s2 = vi2

vi = 5.03 m/s

To find hang time, find the time to the peak and then double it.

vf = vi + a*t

0 m/s = 5.03 m/s + (-9.8 m/s2)*tup

-5.03 m/s = (-9.8 m/s2)*tup

(-5.03 m/s)/(-9.8 m/s2) = tup

tup = 0.513 s


Apr 7th, 2015

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Apr 7th, 2015
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Apr 7th, 2015
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