Read each statement below carefully and tick the correct statements only a) A particle in one dimensional motion with constant speed must have zero acceleration. b) A particle in one dimensional motion with positive value of acceleration must be speeding up. c) A particle in one dimensional motion with zero speed may have non-zero velocity. d) A particle in one dimensional motion moving with constant velocity will have average velocity equal to instantaneous velocity.
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Explanation:
Statements a,b and d are correct .
a)For A particle in one dimensional motion with constant speed no unbalanced forces acting so it will have zero acceleration.
b) When a particle increases the velocity then there is a positive acceleration.
(note here speedand velocity resume to be same thing, though they are different)
D)This statement is mathematically correct.
Option c is wrong because if an object is in motion than its speed can never be zero but its velocity can be zero. An object having,zero speed is at rest,so displacement is 0 and henceforth, velocity is also 0
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