Initial velocity of a body moving along a straight line is 7 ,m/s . It has a uniform acceleration of

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2.Motion in Straight Line

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The initial velocity of a body moving along a straight line is $7 \,m/s$. It has a uniform acceleration of $4\,m/{s^2}$. The distance covered by the body in the $5^{th}$ second of its motion is..........$m$

A

$25$

B

$35$

C

$50$

D

$85$

Solution

(a) ${S_n} = u + \frac{a}{2}\left[ {2n – 1} \right]$

${S_{{5^{th}}}} = 7 + \frac{4}{2}\left[ {2 \times 5 – 1} \right] = 7 + 18 = 25\,m$.

Standard 11

Physics

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