Give an example where the velocity of an object is zero but its acceleration is not zero.

QUESTION:

Give an example where the velocity of an object is zero but its acceleration is not zero.

ANSWER:

For a body thrown up vertically upwards at maximum height its velocity v = o. But still acceleration due to gravity g acts on it.

SO EVEN THOUGH VELOCITY V = 0, STILL ACCELERATION IS NOT ZERO

QUESTION:

Can the coefficient of friction be greater than one?

ANSWER:

Yes. Generally coefficient of friction between any two surfaces is always less than one. But under some special conditions like on extreme rough surfaces coefficient of friction may be greater than one.