A particle is in linear SHM between two points A and B 10cm apart.the direction from A to B is `+` ve.what`ll be the signs of velocity and acceleration when the particle is 4cm away from A going towards A?

The particle is moving toward point O from the end B. This direction of motion is opposite to the conventional positive direction, which is from A and B.Hence the particle’s velocity and acceleration, and the force on it are all negative.