JEE Main Physics question
A 2 m wide truck is moving with a uniform speed ms along a straight horizontal road. A pedestrian starts to cross the road with a uniform speed when the truck is 4 m away from him. The minimum value of , so that he can cross the road safely, is
Answer: (C)
Solution
In the frame of the truck, the pedestrian's relative velocity is . For the minimum crossing speed, this relative-velocity direction must be exactly tangent to the near corner of the truck — i.e. aimed along the diagonal of the right
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