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for bus ,
s=1/2 at
s =1/2×1×t. .....(1)
for student
(50+s)=ut. ......(2)
from (1) and (2)
50+t²/2=ut
t²-2ut+100=0
t=[2u+-√(4u²-400)]/2
t must be real so 4u²-400=0 for t to be minimum
u=10 m/s
s=1/2 at
s =1/2×1×t. .....(1)
for student
(50+s)=ut. ......(2)
from (1) and (2)
50+t²/2=ut
t²-2ut+100=0
t=[2u+-√(4u²-400)]/2
t must be real so 4u²-400=0 for t to be minimum
u=10 m/s
curious00731:
Thanks
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