Which of the following situations is possible?
An object can have acceleration, but constant velocity.
The velocity of an object may be zero but acceleration is not zero.
Distance and the magnitude of displacement are equal in circular motion.
Average speed and the magnitude of average velocity are always equal in circular motion.
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(a)
Let say a stone is thrown in vertical direction with initial speed u. As the time passes its velocity decreases and at the maximum height it attained, its velocity is zero but it has an acceleration (9.8)m/s
2
in the downward direction due to gravity.
(b)
When a pebble is tied with an end of string and it is whirled in horizontal circular motion with the other end of the string at the centre of circular path, then it has a constant magnitude of centripetal acceleration towards the centre. Hence the acceleration is in perpendicular direction to the motion of pebble.
Answer:
I THINK FIRST STATEMENT IS POSSIBLE