Given below shows the desplacemen-time graph for a particle moving along a straight line path.
.
State true or false.
a. Time during which the particle was at reat is `0` to `2s`
b. Time maximum velocity of the particle is `-2.5 ms^(-1)` .

Explanation

a. True, from graph, we see that for time `t=0` to `t=2 s`,
displacement of the particle remains same as `3 m`. It means particle was at restfor this time interval.
b.Ture velocity is maximum when the slope is maximum. And slope is maximum for time`t=5 s` to `t=7 s`. Velocty during this
time =slope`=(0-5)/(7-5) =-2.5 ms^(-1)`.