( 22 % ) Probl 3: A rescue helicopter is hovering over a person whose vessel has
ID: 1878153 • Letter: #
Question
( 22 % ) Probl 3: A rescue helicopter is hovering over a person whose vessel has sunk One of the rescuers tosses a life preserver em straight down to the person with an initial speed of 1.05 m/s and observes that it takes 1.95 s to reach the water. à How high above the water was the preserver released? Note that the downdraft of the helicopter reduces the effect of air resistance on the falling life preserver, so that an acceleration equal to that due to gravity is reasonable. Grade Summary Dedactions Potential 0% 100% Submissions Atempts remaining 10 per attempt) cotan0 asinO acos0 atan0 acotan0 sinh tailed view 0 O Degrees Radians Submit Hint on ner feedhackExplanation / Answer
vi = -1.05 m/s
a = -9.8 m/s^2
t = 1.95 s
use:
d = vi*t + 0.5*a*t^2
= -1.05*1.95 + 0.5*(-9.8)*(1.95)^2
= -2.0475 - 18.6
= -20.6 m
Answer: 20.6 m
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