A 1,000 kg car traveling 15.0 m/s brakes and comes to a stop after traveling 20.0 m. a. What is the car’s initial kinetic e

Question

A 1,000 kg car traveling 15.0 m/s brakes and comes to a stop after traveling 20.0 m.

a. What is the car’s initial kinetic energy?
b. What is the car’s final kinetic energy?
c. How much work does it take to stop the car?
d. How much constant force is applied in bringing the car to a stop?

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Khang Minh 1 year 2021-09-04T15:47:36+00:00 1 Answers 0 views 0

Answers ( )

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    2021-09-04T15:49:29+00:00

    a. initial kinetic
    Ek=1/2mv ²
    Ek=1/2(1000)(15²)
    Ek=112,500J

    b. final kinetic energy=0J
    as it comes to a stop so v=0

    c. Work = ∆Energy
    Or
    Work=Fs

    ∆E/W= initial energy – final energy
    ∆E/W=112,500-0
    ∆E/W=112,500 J

    d.W=Fs

    112,500=F(20)
    112,500/20 =F
    F=5625 N

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