Statement I: A particle is moving on a horizontal surface. Its path will be straight line if initial velocity and acceleration are along same horizontal surface.
Statement II : Angle between $\vec{u} and \vec{a}$ determine path therefore, it may be accelerated or retarded curvilinearly.

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Both statement I and statement II are true but statement II is not the correct explanation of statement II

Both statement I and statement II are true and the statement II is correct explanation of statement I

Statement I is true but statement II is false

Statement I is false but statement II is true

answer is D.

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Detailed Solution

If angle between $\vec{a} a n d \vec{b} i s a c u t e, t h e m o t i o n i s a c c e l e r a t e d a n d c u r v i l i n e a r; b u t i f t h e a n g l e b e t w e e n \vec{u} a n d \vec{a} i s o b t u s e t h e m o t i o n i s r e t a r d e d a n d c u r v i l i n e a r .$