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If (U(t)=150-15t), when will (U(t)=45)?यदि (U(t)=150-15t), तो (U(t)=45) कब होगा?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(t=7\)\(t=7\)
Given \(U(t)=150-15t\), put \(U(t)=45\). This gives \(150-15t=45\), so \(-15t=-105\) and hence \(t=7\). If \(t=9\), the value is \(15\), not 45. Exam tip: In linear decay questions, substitute the target value into the function and solve the resulting equation for \(t\).दिया है \(U(t)=150-15t\)। \(U(t)=45\) रखने पर \(150-15t=45\) मिलता है। अतः \(-15t=-105\), इसलिए \(t=7\)। \(t=9\) रखने पर मान \(15\) आएगा, 45 नहीं। परीक्षा टिप: रैखिक क्षय के प्रश्नों में लक्ष्य मान को फलन में रखकर \(t\) के लिए समीकरण हल करें।
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