Diffraction is observable when the is smaller than the wavelength
Answer:
R=0.5B+0.5C+2A+D
Explanation:
By the triangular law of vector addition
vector R= vector B- vector D
As A,B,C,D are edges of the parallelogram,
A is parallel to D but opposite in direction.
Therefore
;
;

B is parallel to C and in same direction.



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Explanation:
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Answer:
F=50kg
D=5m
W=FD
therefore work done is 250Nm