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Question

একটি গাড়ির বেগ 18ms^-1 । গাড়িটিতে ব্রেক চাপার পর 2ms^-2 মন্দন হতে থাকে। 3 sec পর এর বেগ কত হবে?

27

m s^{- 1}

12

m s^{- 1}

9

m s^{- 1}

3

m s^{- 1}

ANSWER : 2

Descrption

<p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>G</mi><mi>i</mi><mi>v</mi><mi>e</mi><mi>n</mi><mo>,</mo><mo>&nbsp;</mo><mi>u</mi><mo>&nbsp;</mo><mo>=</mo><mo>&nbsp;</mo><mn>18</mn><mo>&nbsp;</mo><mi>m</mi><msup><mi>s</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup><mspace linebreak="newline">&nbsp;</mspace><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mi>a</mi><mo>&nbsp;</mo><mo>=</mo><mo>&nbsp;</mo><mo>-</mo><mn>2</mn><mi>m</mi><msup><mi>s</mi><mrow><mo>-</mo><mn>2</mn></mrow></msup><mspace linebreak="newline">&nbsp;</mspace><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mi>t</mi><mo>&nbsp;</mo><mo>=</mo><mo>&nbsp;</mo><mn>3</mn><mo>&nbsp;</mo><mi>s</mi><mi>e</mi><mi>c</mi><mspace linebreak="newline">&nbsp;</mspace><mi>s</mi><mi>o</mi><mo>,</mo><mo>&nbsp;</mo><mi>v</mi><mo>&nbsp;</mo><mo>=</mo><mo>&nbsp;</mo><mi>u</mi><mo>+</mo><mi>a</mi><mi>t</mi><mspace linebreak="newline">&nbsp;</mspace><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>&nbsp;</mo><mo>=</mo><mn>18</mn><mo>&nbsp;</mo><mo>+</mo><mo>&nbsp;</mo><mo>(</mo><mo>-</mo><mn>2</mn><mo>)</mo><mo>×</mo><mn>3</mn><mo>&nbsp;</mo><mo>=</mo><mo>&nbsp;</mo><mn>12</mn><mo>&nbsp;</mo><mi>m</mi><msup><mi>s</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math></p>

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