Question

1. A boat is moving with a velocity 3i +4j with respect to
ground. The water in the river is moving with a velocity
-3i –4j with respect to ground. The relative velocity of
the boat with respect to water is
(a) 8j
(b) 6i – Sj'
)
6i +8j
(d) 512
(c) 61 +81​

Answer 1

Answer:

6i+8j

Explanation:

given Velocity of boat W.R.T ground is equal to Vbg=3i+4j                                      and Velocity of water W.R.T ground is equal to Vwg = -3i-4j                                   and we know that Velocity of boat W.R.T water is

                                       Vbw=Vbg-Vwg

                                               =3i+4j-{-3i-4j}

                                                 =3i+4j+3i+4j

                                                   =6i+8j

                THEREFORE Velocity of boat W.R.T water is 6i+8j