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Question Number 18543 by virus last updated on 24/Jul/17

Answered by mrW1 last updated on 24/Jul/17

in (2) the force in spring is 50 N  in (1) the force in spring is x  ((100−x)/(10))=((x−50)/5)=a  100−x=2x−100  ⇒x=((200)/3) ≈67 N > 50 N>0  ⇒answer (D)

$$\mathrm{in}\:\left(\mathrm{2}\right)\:\mathrm{the}\:\mathrm{force}\:\mathrm{in}\:\mathrm{spring}\:\mathrm{is}\:\mathrm{50}\:\mathrm{N} \\ $$$$\mathrm{in}\:\left(\mathrm{1}\right)\:\mathrm{the}\:\mathrm{force}\:\mathrm{in}\:\mathrm{spring}\:\mathrm{is}\:\mathrm{x} \\ $$$$\frac{\mathrm{100}−\mathrm{x}}{\mathrm{10}}=\frac{\mathrm{x}−\mathrm{50}}{\mathrm{5}}=\mathrm{a} \\ $$$$\mathrm{100}−\mathrm{x}=\mathrm{2x}−\mathrm{100} \\ $$$$\Rightarrow\mathrm{x}=\frac{\mathrm{200}}{\mathrm{3}}\:\approx\mathrm{67}\:\mathrm{N}\:>\:\mathrm{50}\:\mathrm{N}>\mathrm{0} \\ $$$$\Rightarrow\mathrm{answer}\:\left(\mathrm{D}\right) \\ $$

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