JAMB Physics 2020 Objective — Question 21
Question 21 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2020 Objective paper, with the correct answer and a full explanation.
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21. An object initially at a distance of 10cm from a plane mirror moves at a speed of 10cm/s away from the mirror. What would be the distance between the object and the image after 5s?
- A. A. 1.2mCorrect
- B. B. 60cm
- C. C. 50cm
- D. D. 20cm
Explanation
Additional distance moved in 5s = 10x5 = 50cm. New object distance = 10+50 = 60cm. Image distance (plane mirror) = object distance = 60cm. Distance between object and image = 60+60 = 120cm = 1.2m.
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