During interval AB | Velocity is +ve, so the particle is moving in +ve direction, but it is slowing down as acceleration (slope of v-7 curve) is negative. |
During interval BC | Particle remains at rest as the velocity is zero. Acceleration is also zero. |
During interval CD | Velocity is -ve, so the particle is moving in -ve direction and is speeding up as acceleration is also negative. |
During interval AB | Particle is moving in +ve direction with constant velocity and acceleration is zero. |
During interval BC | Particle is moving in +ve direction as velocity is +ve, but it slows down until it comes to rest as acceleration is negative. |
During interval CD | Velocity is -ve so the particle is moving in -ve direction and is speeding up as acceleration is also negatived |