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A particle in one-dimensional motion. Choose the correct

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with zero speed at an instant may have non-zero acceleration at that instant.

with zero speed may have non-zero velocity.

with constant speed must have zero acceleration.

with positive value of acceleration must be speeding up

answer is A, D.

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Detailed Solution

(1) At the highest point of a vertically upward projected body speed is zero but acceleration is non zero .

$(2) I f t h e s p e e d i s z e r o, v e l o c i t y m u s t b e z e r o .$

$(3) E v e n i f s p e e d r e m a i n s c o n s \tan t, d i r e c t i o n o f v e l o c i t y m a y c h a n g e, h e n c e a c c e l e r a t i o n i n t h a t c a s e i s n o n z e r o .$

(4) v = u + at.

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