The velocity `-` time graph of a particle is as shown in figure

Options

A. It moves with a constant acceleration throughout
B. It moves with an acceleration of constant magnitude but changing direction at the end of every two second
C. The displacement of the particle is zero
D. The velocity becomes zero at `t=4` second

Answer

B

Explanation

Obviously slope of `v-t` graph is changed at `t=2,4,6,`………in direction but it has constant magnitude.