NCERT Solutions for Class 9 Science Chapter 8
Motion
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-113
Questions No-9
State which of the following situations are possible and give an example for each of these:
(a) an object with a constant acceleration but with zero velocity.
(b) an object moving in a certain direction with an acceleration in the perpendicular direction.
(a) Yes, a body can have acceleration even when its velocity is zero. When a body is thrown up, at highest point its velocity is zero but it has acceleration equal to acceleration due to gravity.
(b) Yes, an acceleration moving horizontally is acted upon by acceleration due to gravity that acts vertically downwards.
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(a) An object with constant acceleration but zero velocity: Possible. Example – A ball thrown upwards momentarily stops at the highest point of its trajectory due to gravity, having zero velocity while experiencing constant acceleration.
(b) An object moving with acceleration perpendicular to its direction: Possible. Example – A car moving eastwards turns left, experiencing centripetal acceleration perpendicular to its velocity, enabling circular motion.