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Q.

A person pushes a box kept on a horizontal surface with force of 100 N. In unit vector notation force can be expressed as

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a

100(i^+j^)

b

100(i^−j^)

c

502(i^−j^)

d

502(i^+j^)

answer is C.

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Detailed Solution

F→=Fcos⁡45∘i^+Fsin⁡45∘(−j^)⇒ F→=502i^−502j^N
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A person pushes a box kept on a horizontal surface with force of 100 N. In unit vector notation force can be expressed as