One finds it more difficult to walk on ice than on a concrete road because?

(A) Ice is soft and spongy whreas concrete is hard
(B) The friction between the ice and the feet is less that between the concrete and the feet
(C) There is more friction on ice than on concrete
(D) None of these

A ball tide with a string to a rotating shafat revolves at uniform speed. As the shafat is suddenly brought to rest the string starts getting round the shafat with the regular velocity of the ball?

(A) Increasing
(B) Decreasing
(C) Remaining constant
(D) Becoming zero

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