PHYSICS · Multi correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
A particle is moving along a straight line. Its displacement becomes zero at a certain time t>0, and it does not undergo any collision.
(1) The acceleration of the particle may be zero always.
(2) The acceleration of the particle may be uniform.
(3) The velocity of the particle must be zero at some instant.
(4) The acceleration of the particle must change its direction.