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Read each staremnt below carefully and s...

Read each staremnt below carefully and state with reasons and expamples if it is true or false ,
(a) with zero speed at an instant may have non-zero accelration at that instant
(b) with zero speed may have non-zero velocity
(c ) with positive constant speed must have zero accleration
(d) with positive value of acceleration must be speeding up.

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(a) True,, (b) False, (c) True (if the particle rebounds instantly with the same speed, it implies infinite acceleration which is unphysical), (d) False (true only when the chosen positive direction is along the direction of motion)
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