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A toy car can deliver a constant power o...

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)`

Text Solution

Verified by Experts

The correct Answer is:
B
At maximum velocity, Net force is zero
So `P=Fv=(alphav)vrArr20=alpha(2)^(2)rArralpha=5kg//s`
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