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A body mass 4kg initiallay at rest is moved by a horizntally force 1N on a frictionless table. Find the work done by the force in 4s. Show that this equals the change in K.E. of the body.

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A body of mass 2 kg initially at rest is moved by a horizontal force of 0.5 N on a smooth frictionless table. Obtain the work done by the force in 8 s and show that this equals the change in kinetic energy of the body.

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Knowledge Check

  • A body of mass 1 kg is initially at rest is moved by a horizontal force of 0.5 Nona smooth frictionless table. The value of work done by this force in 10 s is

    A
    10.9 J
    B
    13.1 J
    C
    14.3 J
    D
    12.5 J

  • In Q.4. work done by tangential force on the body is

    A
    zero
    B
    non-zero
    C
    sometimes zero and other times not
    D
    cannot say

  • A body of mass 40 gm is moving with a constant velocity of 2cm//sec on a horizontal frictionless table. The force on the table is

    A
    39200 dyne
    B
    160 dyne
    C
    80 dyne
    D
    Zero dyne

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