A particle is moving along $x$-axis. Its $x$-coordinate varies with time as :
$x=-20+5t^2$
For the given equation match the following two columns :

Column I	Column II
(a) Particle will cross the origin at	(p) zero second
(b) At what time velocity and acceleration are equal	(q) 1 s
(c) At what time particle changes its direction of motion	(r) 2 s
(d) At what time velocity is zero	(s) None of the above

 

• A

   $$\begin{gathered} \left(a\right)\to q \\ \left(b\right)\to r \\ \left(\mathrm{c}\right)\to \mathrm{s} \\ \left(\mathrm{d}\right)\to \mathrm{p} \end{gathered}$$

• B

  $$\begin{gathered} \left(a\right)\to r \\ \left(b\right)\to q \\ \left(\mathrm{c}\right)\to \mathrm{s} \\ \left(\mathrm{d}\right)\to \mathrm{p} \end{gathered}$$

• C

  $$\begin{gathered} \left(a\right)\to r \\ \left(b\right)\to q \\ \left(\mathrm{c}\right)\to p \\ \left(\mathrm{d}\right)\to s \end{gathered}$$

• D

  $$\begin{gathered} \left(a\right)\to p \\ \left(b\right)\to q \\ \left(\mathrm{c}\right)\to \mathrm{s} \\ \left(\mathrm{d}\right)\to r \end{gathered}$$