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Physics-

General

Easy

Question

A 2 Kg block moving with 10 m/s strikes a spring of constant $pi to the power of 2 end exponent$ N/m attached to 2 Kg block at rest kept on a smooth floor. The time for which rear moving block remain in contact with spring will be

$\sqrt{2} s e c$
$\frac{1}{\sqrt{2}} s e c$
1 sec
$\frac{1}{2} s e c$

The correct answer is: 1 sec

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Let u(x) be a twice differenctiable function defined in $0 less or equal than x less or equal than 1 comma$ holds the relation $u to the power of ´ ´ end exponent left parenthesis x right parenthesis equals e to the power of x end exponent u left parenthesis x right parenthesis text in end text x element of left square bracket 0 , 1 right square bracket. text If end text 0 less than x subscript 0 end subscript less than 1 comma$ then

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Let $f left parenthesis x right parenthesis equals x left square bracket x right square bracket$ where $left square bracket x right square bracket$ denotes the greatest integer smaller than or equal to x. When x is not an integer, what is f’ (x) ?

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parallel

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