Q. A body moves with initial velocity $10\ ms^{- 1}.$ If it covers a distance of $20m$ in $2s$, then acceleration of the body is
A) Zero
B) $10ms^{- 2}$
C) $5ms^{- 2}$
D) $2ms^{- 2}$
Explanation
(a) Here, $u = 10\ ms^{- 1},\ t = 2s,\ S = 20\ m$
Using $S = ut + \frac{1}{2}at^{2}$
$\therefore\ 20 = 10 \times 2 + \frac{1}{2} \times a \times 2^{2}$
$0 = 2a \Rightarrow a = 0$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.