Determine the acceleration of the fireman while stopping Problem 2.38 Express yo

Question

Determine the acceleration of the fireman while stopping Problem 2.38 Express your answer to two significant figures and include the appropriate units. Enter positive value if the acceleration is downward and negative value If the acceleration is upward. An 82-kg fireman slides 5.2 m down a fire pole. He holds the pole, which exerts a 550-N steady resistive force on the fireman. At the bottom he slows to a stop in 0.45 m by bending his knees. a2 = 13, 1 Submit My Answers Give Up Incorrect; Try Again; 2 attempts remaining Part F Determine the time it takes for the fireman to stop after reaching the ground Express your answer to two significant figures and include the appropriate units. #2 Value Units

Explanation / Answer

during first 5.2 m,

Fnet = m g - f = m a

82 x 9.8 - 550 = 82 a

a = 3.09 m/s^2

vf^2 - vi^2 = 2 a d

v^2 - 0^2 = 2 (3.09)(5.2)

v = 5.67 m/s

after that he stops inm 0.45 m.

0^2 - 5.67^2 = 2 (a) (0.45)

a = - 35.7 m/s^2 ..........Ans

(F) vf = vi + a t

0 = 5.67 - 35.7 t

t = 0.16 sec

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