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A 2m wide truck is moving with a velocity of 10m/s along a straight road of width 2m. A man starts crossing the road with uniform speed V across the road when the truck is 4m away. The minimum value of V to cross the road safely is ?
A 2m wide truck is moving with a velocity of 10m/s along a straight road of width 2m. A man starts crossing the road with uniform speed V across the road when the truck is 4m away. The minimum value of V to cross the road safely is ?


4 years ago

Shaswata Biswas
132 Points
							Let the man crosses the road in time t.Distance to be covered, V.t = 2 m=> t = 2/V sNow velocity of the truck is 10 m/s.So, distance travelled in time = 10.t Now, for safe crossing, 10t\leq 4 m\implies 10 \times \frac{2}{V} \leq 4\implies V \geq 5 m/sSo, the minimum reqiured velocity of the man is 5 m/s.THANKS

4 years ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions