Question

A water skier has a mass of 73 kg. (a) Find the magnitude of the net force actingon the skier when she is accelerated from rest to a speed of13 m/s in 7.1 s. N (b) Find the magnitude of the net force acting on the skier whenshe lets go of the tow rope and glides to a halt in 24 s. N

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asked 2020-10-25
A water skier has a mass of 73 kg.
(a) Find the magnitude of the net force actingon the skier when she is accelerated from rest to a speed of13 m/s in 7.1 s. N
(b) Find the magnitude of the net force acting on the skier whenshe lets go of the tow rope and glides to a halt in 24 s. N

Answers (1)

2020-10-26
\(\displaystyle{F}={m}{a}={m}?{\frac{{{v}}}{{{t}}}}={\frac{{{73}\times{13}}}{{{7.1}}}}={134}{N}\)
\(\displaystyle{F}={m}{a}={m}?{\frac{{{v}}}{{{t}}}}={73}\times{\frac{{{13}}}{{{24}}}}={39.5}{N}\)
2. v initial = 0 v final = 13 m/s t= 7.1s
v=vo +at
partb. vo= 13 vf=0 t=24s 13=7.1a
usethe same process as in part a and note that your a= 1.83m/s2 accelerationwill be negative, giving you a negative netforce
?F=ma
F=(73 kg)( 1.83 m/s2)
F=133.59 N
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