General
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Physics-

The displacement-time graph of a moving object is shown in figure. Which of the velocity-time graphs shown in figure could represent the motion of the same body?

Physics-General

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    Answer:The correct answer is: Think of the lope of the given displacement-time graph at different points and you would arrive at the correct answer.
    Alternatively, look at the self-illustrative figure.

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    A body of mass m is resting on a wedge of angle theta as shown in figure. The wedge is given at acceleration alpha. What is the value of a son that the mass m just falls freely?

    physics-General
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    B C equals fraction numerator 1 over denominator 2 end fraction a t to the power of 2 end exponent and A B equals fraction numerator 1 over denominator 2 end fraction g t to the power of 2 end exponent
    tantheta equals fraction numerator A B over denominator B C end fraction equals fraction numerator g over denominator a end fractionor a equals fraction numerator g over denominator t a n theta end fraction equals g blank c o t theta
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    physics-

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    For the velocity-time graph shown in figure below the distance covered by the body in last two seconds of its motion is what fraction of the total distance covered by it in all the seven seconds

    physics-General
    fraction numerator open parentheses S close parentheses subscript open parentheses l a s t blank 2 s close parentheses end subscript over denominator open parentheses S close parentheses subscript 7 s end subscript end fraction equals fraction numerator table row cell fraction numerator 1 over denominator 2 end fraction cross times 2 cross times 10 end cell row cell end cell end table over denominator table row cell fraction numerator 1 over denominator 2 end fraction cross times 2 cross times 10 plus 2 cross times 10 plus fraction numerator 1 over denominator 2 end fraction cross times 2 cross times 10 end cell row cell end cell row cell end cell end table end fraction equals fraction numerator 1 over denominator 4 end fraction