An object is initially at a distance of 160 cm from a plane mirror.If the plane mirror is approachesthe object at a speed of 10cm/s.Then what will be the distance between the object and the mirror after 4 seconds.
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priyanka33449
priyanka33449
19.04.2020
Physics
Secondary School
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An object is Initially at a distance of 100cm from a plane mirror. If the mirror approaches the object at a speed of 5cm/s.Then after 6s the distance between the object and its image will be......
a. 60
b. 140
c. 170
d. 150
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arenarohith
arenarohith Genius
Answer:
b. 140
Explanation:
The distance of object from plane mirror D=100cm
So, initial distance of image and object
=100−(−100)
=200cm
Now, object approaches the mirror with the speedv=5cm/s
So, distance travelled by object in 6 sec
D=5×6
D=30cm
At this instant,
Distance between mirror and object
D=100−30
D=70cm
Now, the distance between image and object is
D=70−(−70)
D=140cm
Explanation:
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