An object falling through a fluid is observed to have acceleration given by a = g – bv where g = gravitational acceleration and b is constant. After a long time of release, it is observed to fall with constant speed. What must be the value of constant speed?
An object falling through a fluid is observed to have acceleration given by a = g – bv where g = gravitational acceleration and b is constant. After a long time of release, it is observed to fall with constant speed. What must be the value of constant speed?
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1 Answer
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This is a short answer type question as classified in NCERT Exemplar
When speed becomes constant then acceleration will be zero
a=dv/dt=0
But here a=g-bv
Clearly from above equation as speed increases acceleration will decrease . at a certain speed say vo, acceleration will be zero and speed will remain constant.
Hence So g=bv
so v= g/b
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[E] = ML2T-2
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[P] = MLT-1
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