3-2.Motion in Plane
easy

किसी प्रक्षेप्य का प्रारंभिक बिन्दु $A$ पर वेग $(2 \hat{i}+3 \hat{j})$ $m / s .$ है, तो इसका बिन्दु $B$ पर वेग $( m / s$ में) होगा

A

$\;\left( { - 2\hat i - 3\hat j} \right)$

B

$\;\left( { - 2\hat i + 3\hat j} \right)$

C

$\;\left( {2\hat i - 3\hat j} \right)$

D

$\;\left( {2\hat i + 3\hat j} \right)$

(AIPMT-2013)

Solution

$\begin{array}{l}
At\,{\rm{ point}}\,B\,X\,component\,of\,velocity\,\\
remains\,unchange\,while\,Y\,component\\
reverses\,its\,direction\\
\therefore \,The\,velocity\,of\,the\,projectile\,at\,{\rm{ point}}\\
B\,is\,2\hat i – 3\hat j\,m/s.
\end{array}$

Standard 11
Physics

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