Motion in a Plane - Result Question 30

33. The velocity of a projectile at the initial point $A$ is $(2 \hat{i}+3 \hat{j}) m / s$. It’s velocity (in $m / s$ ) at point B is

[2013]

(a) $-2 \hat{i}+3 \hat{j}$

(b) $2 \hat{i}-3 \hat{j}$

(c) $2 \hat{i}+3 \hat{j}$

(d) $-2 \hat{i}-3 \hat{j}$

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Answer:

Correct Answer: 33. (b)

Solution:

  1. (b) At point B the direction of velocity component of the projectile along $y$-component reverses, while the $x$-component remains unchanged.

Hence, $ \vec{V} _B=2 \hat{i}-3 \hat{j}$