A 2m wide truck is moving with a uniform...

A `2m` wide truck is moving with a uniform speed `v_(0)=8m//s` along a straight horizontal road. A pedestrian starts to cross the road with a uniform speed `v` when the truck is `4m` away from him. The minimum value of `v` so that he can cross the road safely is

`1.6sqrt()5` m/s

`1.2 sqrt()5` m/s

`1.2 sqrt()7` m/s

`1.6sqrt()7` m/s

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