



 
Moumita, F is the symbol for the force vector. As any vector it has a magnitude and a direction. The magnitude of F is F = 20 newtons and its direction is described by the vector A = 4j + 3k. The magnitude of the vector A is √(4^{2} + 3^{2}) = √(16 + 9) = √25 = 5. Thus F must be 4 times A. What is F? Penny  


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