Question

how can two forces of 3 N and 4 N combine to give forces of (a) 7 N and (b) 1 N

Answer 1

HEY MY FRIEND U R ANSWER IS HERE

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3N + 4N = 7N

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So option A is correct

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HOPE U UNDERSTAND☺☺

Answer 2

if they act along same direction then 4+3=7
if they act along opposite direction then 4-3=1