x - अक्ष के साथ गतिमान एक वस्तु की स्थिति x = 12 t2 – 2t3 दी गयी है, जहाँ x मीटर में है और t सेकेंड में है। तो t = 3.0 s पर वस्तु का त्वरण क्या है?

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ISRO VSSC Technical Assistant Mechanical 9 June 2019 Official Paper
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  1. -12 m/s2
  2. +9 m/s2
  3. +12 m/s2
  4. -9 m/s2

Answer (Detailed Solution Below)

Option 1 : -12 m/s2
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Detailed Solution

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संकल्पना:

यदि x, t का एक फलन है अर्थात् x = f(t) है, तो

वेग (v) = और

त्वरण (a) = 

गणना:

दिया गया है:

x = 12t2 – 2t3

वेग निम्न है:

त्वरण निम्न है:

t = 3s पर त्वरण 

(a)t = 3 = 24 - (12 × 3) = -12 m/s2

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