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A particle moves with an initial velocity `V_(0)` and retardation `alpha v` , where `alpha` is a constant and v is the velocity at any time t. After how much time, speed of particle decreases by `75%`A. `(2l n2)/(alpha)`B. `(l n(4//3))/(alpha)`C. `(3V_(0))/(4alpha)`D. `(e^(4))/(alpha)` |
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Answer» Correct Answer - D After how …………. `V = (V_(0))/(4) implies V_(0)e^(-alpha t)= (V_(0))/(4)` `-alpha t = l n(1)/(4) implies t = (2l n2)/(alpha)` |
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