A 2-m wide truck is moving with a uniform speed \( v_{0}=8 \mathrm{~ms}^{-1} \) along a straight...

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A 2-m wide truck is moving with a uniform speed \( v_{0}=8 \mathrm{~ms}^{-1} \) along a straight horizontal road. A pedestrian
P starts to cross the road with a uniform speed \( v \) when the truck is \( 4 \mathrm{~m} \) away from him. The minimum value of \( v \) so
W that he can cross the road safely is
(1) \( 2.62 \mathrm{~m} \mathrm{~s}^{-1} \)
(2) \( 4.6 \mathrm{~m} \mathrm{~s}^{-1} \)
(3) \( 3.57 \mathrm{~m} \mathrm{~s}^{-1} \)
(4) \( 1.414 \mathrm{~m} \mathrm{~s}^{-1} \)
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