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a 2m wide truck is moving with a uniform speed of 8m/s along a straight horizontal road. a pedestrian starts crossing the road at an instant when the truck is 4m away from him. the minimum constant velocity with which he should run so as to avoid the accident
 
 

Asked by jaychandran1967 20th December 2017, 11:46 AM
Answered by Expert
Answer:
pedestrian is 4 m away when he want to cross the road. Hence if the truck moves with 8 m/s speed it will take 0.5 s to reach pedastrian.
 
During this 0.5 s, pedastrian has to cross the width of truck which is 2 m. Hence the required minimum speed = 2/0.5 = 4 m/s
Answered by Expert 20th December 2017, 1:46 PM
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