When a girl moves towards a plane mirror at a speed of 4.0m/s, the distance between the girl & her image reduces at a speed of
- 2 m/s
- 4 m/s
-
8 m/s
- 12 m/s
The correct answer is: C
Explanation
| v | = | d
t |
or | v | α | d |
d = x, v = 4m/s
d = 2x, v = ? (girl & image)
| v | = | 2 × 4
x |
= | 8 | m
s |
There is an explanation video available .