Physics
It is more difficult to walk on ice than on a concrete road because

Ice is soft when compared to concrete
There is more friction between the ice and feer
None of these
There is very little friction between the ice and feet pressing it

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Physics
Stationary wave is formed by

Two waves of same frequency travelling in the same direction
A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the opposite direction
Two waves of the same speed superposing

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