For the acceleration-time $(a-t)$ graph shown in figure, the change in velocity of particle from $t=0$ to $t=6 \,s$ is ........ $m / s$
Refer to the graph in figure. Match the following
Graph | Characteristics |
$(A)$ | $(i)$ has $v > 0$ and $a < 0$ throughout |
$(B)$ | $(ii)$ has $x > 0,$ throughout and has a point with $v = 0$ and a point with $a = 0$ |
$(C)$ | $(iii)$ has a point with zero displacement for $t > 0$ |
$(D)$ | $(iv)$ has $v < 0$ and $a > 0$ |
If $x \propto {t^{5/2}}$ , then
Give important factor to control the speed of vehicle in area of school or hospital.