Physics problem in work, power and energy?

A truck weighing 1000 kgf changes its speed from 36 km/hr to 72 km/hr in 2 minutes . Calculate the

(1) work done by the engine

(2) and its power

Take g as 10m/s^2

Please tell me how to solve this problem and show the working as well

:)

3 Answers

Relevance
  • 8 years ago
    Best Answer

    72 km/h = 20 m/s

    36km/h = 10 m /s

    Work done by the engine is the change in kinetic energy of the body.

    = 0.5 * 1000*( 20^2 – 10^2) = 150000 J

    --------------------

    Power = work /time = 150000/ (2*60) = 125 J/s = 1250 W

    =====================

  • jon
    Lv 4
    3 years ago

    The mass of 15kg has already been secure contained in the calculation to get 120N. artwork finished = one hundred twenty x 6.2 = 744J Time taken = 6.2 ÷ 3.2 = a million.94s capacity = 744 ÷ a million.ninety 4 = 383.5J/s (Watts)

  • 8 years ago

    These questions are so old I can't remember them anyway:

    (1) W=Fxd

    F is force

    d is distance

    F=mxg

    F=1000x10

    F=10^4

    V=m/s m=Vxs (m is distance in meters)

    V1 is 36x1000/3600

    v2 is 72x1000/3600

    V=Vf-Vi

    V=V2-V1

    M=Vx2x60

    W=Fxd

    (20) P=W/t

    P=W/2x60

    I hope i am totally correct :P

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