Question

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

• A. $25m$
• B. $35m$
• C. $50m$
• D. $85m$

Answer 1

The correct option is A $25m$

Given,

$u=7m/s$

$a=4m/s^2$

$n=5$

The distance covered by the body in $n^{th}sec$ is given by

$S_n=u+\frac{a}{2}(2n-1)$

$S_5=7+\frac{4}{2}(2\times 5-1)$

$S_5=25m$

The correct option is A.