Force Is Requ O https tPrebi . IlQ,Search Problem 4.07 Part A What average force

Question

Force Is Requ O https tPrebi . IlQ,Search Problem 4.07 Part A What average force is required to stop a 1100 kg car in 70 s it the car is traveling at 85 km/h? Express your answer to two direction of the force is in the direction opposite to the initial velocity Sigures and include the -ppropriate units Efter positive value it the directi sofknee is in the direction of the initial veloch, and negative value inhe Units Incorrect; Try Again; 5 attempts remaining Check your signs X O Type here to search

Explanation / Answer

given

mass m = 1100 kg

speed v = 85 km/h

v = 85*1000/3600 = 23.61 m/s

from the relation

a = vf-vi/t

here vf = 0

a = -23.61/7 = -3.37 m/s^2

from netwons second law

favg = ma

f avg = 1100*(-3.37) = -3707 N

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