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Question

A smooth inclined plane of length L having inclination θ with the horizontal is inside a lift which is moving down with retardation a. The time taken by a body to slide down the inclined plane, from rest, will be
  1. t=2L(g+a)sinθ
  2. t=2Lgsinθ
  3. t=2L(ga)sinθ
  4. t=2Lasinθ


Solution

The correct option is A t=2L(g+a)sinθ
Downward retardation means upward acceleration.
g'= g + a
Now t=2Lgsinθ or t=2L(g+a)sinθ
 

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