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A toy car can deliver a constant power of `20W`. The resistive force on the car is `alphav`, where `v` is velocity of car in `m//s`. If maximum velocity of car is `2m//s`, the value of `alpha` is .A. `10 kg//s`B. `5kg//s`C. `15kg//s`D. `5 kg//s^(2)` |
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Answer» Correct Answer - B At maximum velocity, Net force is zero So `P=Fv=(alphav)vrArr20=alpha(2)^(2)rArralpha=5kg//s` |
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