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March 25, 2017

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A 109 kg fullback runs at the line of scrimmage.
(a) Find the constant force that must be exerted on him to bring him to rest in a distance of 1.1 m in a time interval of 0.22 s.
(b) How fast was he running initially?

  • physics - ,

    Average V during deceleration = 1.1/0.22 = 5 m/s
    Initial V = Vo = 2*Vav = 10 m/s
    Deceleration rate = a = Vo/0.22s
    = 45.5 m/s^2
    Force = m*a

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