An ice cube has been given a push and slides without friction on a level table . Which is correct?

A sentence has been given with a blank to be filled with an appropriate word. Choose the correct alternative. The origin of ice-cream dates back ________ nearly half-a-century.

A piece of ics slides down a 45^(@) incline in twice the time it takes to slide down a frictionless 45^(@) incline . What is the coefficient of friction between the ice and the incline ? .

A piece of ice slides down a 45^(@) incline in twice the time it takes to slide down a frictionless 45^(@) incline . What is the coefficient of friction between the ice and the incline ? .

A piece of ice slides down a rough inclined plane at 45^(@) inclination in twice the time that it takes to slide down an identical but frictionless inclined plane. What is the coefficient of friction between ice and incline ?

An ice cube containing a piece of lead floats in water What would be the effect on the level of water if the ice cube melts ?