Question

6. Mark the incorrect statement in the following
(a) The sign of acceleration tells us whether the particle's
speed is increasing or decreasing
(b) The zero velocity of a particle's speed is increasing or
decreasing
(c) The zero velocity of a particle does not necessarily
imply zero acceleration at that instant
1
(d) The kinematic equations (v = u + at, s = ut +
at,
2
v2 = u2 + 2as) are true only for motion in which the
magnitude and the direction of acceleration are constant
during the course of motion.​

Answer 1

All options are correct except C because, if the velocity is zero at an instant, then acceleration may not necessarily be zero at that instant.

For e.g. when an object is thrown vertically upward, at highest point velocity is zero but acceleration on it due to gravity is non-zero.

Option D is correct as the derivative of velocity will be zero in case velocity is zero for a time interval,

HOPE IT HELPS...