Questions
A man is" d" distance behind the bus. when the bus starts from rest with an acceleration , With what minimum constant velocity should the man start running to catch the bus
detailed solution
Correct option is C
constant velocity of man be v let The man catches the bus at point P, after time t for Uniform motion :→d+s = Vt from figure s=vt-d-- → (1)bus accelerate from rest,acceleration of bus is a0 s = 0+12 a0 t2 → (2) substitute equation (1) vt-d=12 a0 t2 ⇒ a0 t2 -2vt+2d=0 The man will catch the bus, if time t is real, for time t to be consider discriminant [(−2V)2 − 4a0 ⋅ 2d] ≥ 0 V2 − 2a0 d ≥ 0 V ≥ 2a0 d Vmin = 2a0 dTalk to our academic expert!
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