some exterme sport enhuisasts have been know to jump off the top of El capitan,

Question

some exterme sport enhuisasts have been know to jump off the top of El capitan, a sheer granite cliff of height 910.0 m in Yosemite National park. Assume a jumber runs horizontally off the top of El Capitan with a speed of 4.2 m/s. The person enjoys free-fall until 144.5 m from the ground, at which time he/she opens a parachute.

1- how long (time) is the person in free-fall?

2- it is very important that the parachute be far away form the cliff when opened. how far is the jumber from the cliff when opening the parachute?

Explanation / Answer

S = ut - 0.5gt2 where u = 0

so t = ?(2S/g) = ?(2x765.5/9.8) ? 12.5s

(ii) horizontal distance covered = vt = 4.2 x 12.5 = 52.5m Ans

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