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Physics Work Magnitude HELP!!!!?

Given that the tree doesn’t move, and the car comes to rest: 

a.) Find the amount of work done by the tree on the car as the front of the car crashes into the tree, but use m = 2525 kg instead.  

  

b.)  Find the magnitude of the force that pushed in the front of the car by 42.0 cm 

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  • 1 month ago
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    Kinetic Energy in J if m is in kg and V is in m/s

    KE = ½mV²

    KE = ½2525(12)² = 181800 J

    Find the magnitude of the force that pushed in the front of the car by 42.0 cm

    assuming this means the car came to a stop in 42 cm with constant acceleration

    v² = v₀² + 2ad

    0 = (12)² + 2a(0.42)

    0.84a = –144

    a = –176 m/s²

    F = ma = 2525 x 176 = 443000 N

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  • 1 month ago

    energy = 1/2 m v-squared

    we need to know how long the crash took (from beginning of crash to end of crash)

    or the rate of deceleration

    in order to calculate the force

    • DeShawn1 month agoReport

      Please submit answer with work instead of instructing what to do.

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