Figure shows the displacement-time graph of a particle moving in a straight line. Find the signs of velocity and acceleration of particle at time `t = t_1 and t = t_2.`

Answer

A, B, D

Explanation

At time `t=t_1,` slope of s-t graph (=velocity) is
positive and increasing. Therefore velocity is
positive and accleration is also positive.
At time `t=t_2` slope is negative but decreasing
(in magnitude). Therefore velocity is negative but
decreasing in magnitude. Hence, acceleration is
positive.