Question

The initial velocity of a body moving along a straight line is 7 $\frac{m}{s}$. It has a uniform acceleration of 4 $\frac{m}{s^2}$. 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 $25m$

$S_n=u+\frac{a}{2}[2n-1]$
$S_5{}^{th}=7+\frac{4}{2}[2\times 5-1]=7+18=25m.$