23 Apr 2020

Class 10 ICSE Selina MATH EX 6D question 7 The speed of a boat in still water is 15 km/hr. It can go 30 km upstream and return downstream to the original point in 4 hours 30 minutes. Find the speed of the stream


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If Poisson's ratio σ for a material is −1/2 , then the material is

 1. Elastic fatigue 2. Incompressible-- Correct 3. Compressible 4. None of the above