Question

(3) -
+8)
(4) 81-31
The velocities of A and B are Va=2i+4j and Vb. = 3i -7j. Velocity of B as observed by Ais
(1) 5i-3j
(3) -i+11j
(2)i-11j
(4) 2i-3j​

Answer 1

Answer:

Answer is 3)-i+11j

Explanation:

V of b as observed by a=v of b - v of b=3i-7j-2i-4j

=i-11j

Answer 2

Answer:

$v_{BA}=-i+11j$

Explanation:

It is given that,

Velocity of A, $v_A=2i+4j$

Velocity of B, $v_B=3i-7j$

We need to find the velocity of B as observed by A or with respect to A.

So, $v_{BA}=v_A-v_B$

$v_{BA}=2i+4j-(3i-7j)$

$v_{BA}=-i+11j$

So, the velocity of B with respect to A is $v_{BA}=-i+11j$. Hence, the correct option is (3).