Answer:
Explanation:
Work done is defined as the product of force and the displacement in the direction of force.
W = F x d x Cos θ
Where, θ be the angle between force and the displacement.
The force of gravity acts downwards and the displacement is in upward, so the angle is 180. cos 180 = -1 , so the work done by the force of gravity is negative.
The force of rope acting in upwards direction and displacement also in upwards direction.
So, the work done is positive
Answer:
<h2>
Answer⤵</h2><h3><u>i</u><u>)</u><u>The first law of reflection states that the incident ray, the reflected ray, and the normal to the surface of the mirror, all lie in the same plane. </u></h3><h3><u>i</u><u>i</u><u>)</u><u>The second law of reflection states that the angle of reflection is equal to the angle of incidence. Both angles are measured with respect to the normal to the mirror.</u></h3>
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