When a man moves toward a plane mirror at a speed of 6m/s, the distance…

Physics JAMB 2015

When a man moves toward a plane mirror at a speed of 6m/s, the distance the man and his image increased at a speed of?

  • 2 m/s
  • 4 m/s
  • 12 m/s checkmark
  • 14 m/s

The correct answer is: C

Explanation

d = y, s = 6 m/s (The Man & Plane Mirror)

d โ€“ ฮดy, s = (5 &ndash ;6) m/s (The Man and Image)

d2 รท s1 = d2 รท s2, y รท 6 = 2y รท s + 6

Y (s + 6) = 2y ร— 6

s + 6 = 12

So = 12 โ€“ 6 = 6

Since S + 6 = 0

Then, S = 6 (substitute the value of S i.e S = 6)

Into S + 6 = 0

โˆดSo = S + 6 = 6 + 6 = 12 m/s

โˆด S = 12 m/s

There is an explanation video available .

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