NEET 2011
- Exam
- NEET
- Year
- 2011
- Subject
- Physics
- Chapter
- Motion in One Dimension
NEET 2011 · Physics · Motion in One Dimension
A body is moving with velocity 30 ~m / s towards east. After 10 ~s...
A body is moving with velocity towards east. After its velocity becomes towards north. The average acceleration of the body is
Options
- A
- B
- C
- D
Correct answer
C.
Step-by-step solution
\begin{aligned}& \text{ Average acceleration }=\frac{\text{ Change\text{ in } velocity }}{\text{ Total time }}\\
& \qquad \begin{aligned}a & =\frac{\left|\overrightarrow{\mathbf{v}}_f-\overrightarrow{\mathbf{v}}_i\right|}{\Delta t}\\
& =\frac{\sqrt{30^2+40^2}}{10}=\frac{\sqrt{900+1600}}{10}\\
& =5 \mathrm{~ms}^{-2}
\end{aligned}
\end{aligned}$