Ladder against a wall, foot pulled away at a given rate: how fast the top slides down

1. A.
   $\frac{4}{3}$ m/sec
2. B.
   $\frac{2}{3}$ m/sec
3. C.
   $\frac{5}{3}$ m/sec
4. D.
   $\frac{8}{3}$ m/sec

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1. A.
   $\frac{5}{8}$ m/sec
2. B.
   $\frac{8}{15}$ m/sec
3. C.
   $-\frac{8}{15}$ m/sec
4. D.
   $\frac{15}{8}$ m/sec

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1. A.
   $\frac{5}{4}$ ft/sec upwards
2. B.
   $\frac{4}{5}$ ft/sec upwards
3. C.
   $\frac{5}{4}$ ft/sec downwards
4. D.
   $\frac{4}{5}$ ft/sec downwards

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