A winch raises an object of mass 20 kg from rest with an acceleration of 0.2ms 2. How much work is done by the winch in the first 12 seconds?

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(a) A winch raises an object of mass 20 kg from rest with an acceleration
of 0.2ms 2. How much work is done by the winch in the first 12
seconds?
(b) Find the work done by a force F = (5i + 3j) N whose point of
application undergoes a displacement s = (3i + 7j) m.
(c) A force F = (2i – j+3k) N acts on a particle which moves from point
A with position vector (-2i + j- 3k) m to a point B with position
vector (5i - j+ 3k) m. Find the work done by the force.
Transcribed Image Text:(a) A winch raises an object of mass 20 kg from rest with an acceleration of 0.2ms 2. How much work is done by the winch in the first 12 seconds? (b) Find the work done by a force F = (5i + 3j) N whose point of application undergoes a displacement s = (3i + 7j) m. (c) A force F = (2i – j+3k) N acts on a particle which moves from point A with position vector (-2i + j- 3k) m to a point B with position vector (5i - j+ 3k) m. Find the work done by the force.
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