The kinetic energy of an object of
mass, m moving with a velocity
of 5 m s–1 is 25 J. What will be its
kinetic energy when its velocity
is doubled? What will be its
kinetic energy when its velocity
is increased three times?
A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
Write an expression for the work done when a force is acting on an object in the direction of its displacement.
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