The velocity of a bullet is reduced from $200\,m/s$ to $100\,m/s $ while travelling through a wooden block of thickness $10\,cm$. The retardation, assuming it to be uniform, will be
$10 \times {10^4}$ $m/s^2$
$12 \times {10^4}$ $m/s^2$
$13.5 \times {10^4}$ $m/s^2$
$15 \times {10^4}$ $m/s^2$
A scooter accelerates from rest for time $t_{1}$ at constant rate $a _{1}$ and then retards at constant rate $a _{2}$ for time $t _{2}$ and comes to rest. The correct value of $\frac{t_{1}}{t_{2}}$ will be ..... .
Figure gives the $x -t$ plot of a particle executing one-dimensional simple harmontc motion. Give the signs of position, velocity and acceleration variables of the particle at $t=0.3 \;s , 1.2\; s ,-1.2\; s$
The velocity $(v)$ of a particle moving along $x$-axis varies with its position $x$ as shown in figure. The acceleration $(a)$ of particle varies with position $(x)$ as
The acceleration of a moving body can be found from
The correct statement from the following is