Motion

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Q 1. The basic unit of time is

an hour

a minute

a second

None of these

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Q 2. A person travelling on a strainght line moves with a uniform velocity {tex}v_1{/tex} for some time and with uniform velocity {tex}v_2{/tex} for the next equal time. The average velocity {tex}v{/tex} is given by : -

{tex}v=\frac{v_1+v_2}{2}{/tex}

{tex}v=\sqrt{v_1v_2}{/tex}

{tex}\frac{2}{v}=\frac{1}{v_1}+\frac{1}{v_2}{/tex}

{tex}\frac{1}{v}=\frac{1}{v_1}+\frac{1}{v_2}{/tex}

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