Sarah, who has a mass of 55 kg, is riding in a car at 20 m/s. She sees a cat crossing the street and slams on the brakes! Her seatbelt stops her from flying forward, bringing her to rest in 0.5 seconds

Question

Mathematics

Shyla Lewis

10 January, 12:44

Sarah, who has a mass of 55 kg, is riding in a car at 20 m/s. She sees a cat crossing the street and slams on the brakes! Her seatbelt stops her from flying forward, bringing her to rest in 0.5 seconds

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Answers (1)

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Agustin Reilly · Answer 1

F = (mass) (acceleration) = ma

m = 55 kg

Vi = 20 m/s

t = 0.5 s

Vf = 0 m/s (since she was put to rest)

a = (Vf-Vi) / t

a = (0-20) / 5

a = 40 m/s^2 (decelerating)

F = ma = (55 kg) (40 m/s^2)

F = 2200 N

Hope this answer will be a good h elp for you.