According to the question,
Velocity of car B w.r.t. mirror of car
A,vBM=40m∕s Distance of car B from mirror of car
A,u=1.9m=190cm Focal length of mirror, f = 10 cm
We have to find the velocity of image of car B in the mirror, i.e.
vIM We know that,
vIM=−m2vBM ....(I)
where, m is the magnification produced by mirror of car A,
⇒m== == Substituting the values in Eq. (i), we get
vIM=−()2×40 =−×40=−0.1m∕s Here, negative sign shows that, the speed of image w.r.t. mirror ofcar A is in opposite direction.