Question

# A plane mirror is placed in yz plane facing towards negative x axis. The mirror is moving parallel to y axis with a speed of 5 cm/s. A point object P is moving in front of the mirror with a velocity 3cm/s ¯i+4cm/s ¯j+5cm/s ¯k . The velocity of image respect to mirror is :

A
3cm/s ¯i+4cm/s ¯j+5cm/s ¯k
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
3cm/s ¯i1cm/s ¯j+5cm/s ¯k
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
3cm/s ¯i4cm/s ¯j5cm/s ¯k
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
3cm/s ¯i4cm/s ¯j5cm/s ¯k
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

## The correct option is B −3cm/s ¯i−1cm/s ¯j+5cm/s ¯kLet the velocities of the object and the image with respect to mirror be Vu and Vv respectively.Velocity of the mirror is 5cm/s¯jVu=(3¯i+4¯j+5¯k)−(5¯j)cm/s=(3¯i−1¯j+5¯k)cm/sComponents of Vu and Vv parallel to the mirror are same.Therefore Vv∥=(−1¯j+5¯k)cm/sComponents of Vu and Vv perpendicular to the mirror are equal in magnitude but opposite in direction.. Therefore Vv⊥=(−3¯i)cm/sTherefore, velocity of the image with respect to the mirror is: Vv=(−3¯i−1¯j+5¯k)cm/s

Suggest Corrections
0
Related Videos
Moving Object and Mirror
PHYSICS
Watch in App