A $3$ kg mass on a spring is stretched $7$ cm and then let go$.$ It oscillates back and forth with a period of $1\mathrm{.}2$ s$\mathrm{.}21.$ What is the spring constant k$?$a$)82$ N$/$mb$)610$ N$/$mC$)64$ N$/$md$)39$ N$/$m$23.$ What is its position at t $=1$ s$?$a$)5\mathrm{.}4$ cmb$)7\mathrm{.}0$ cmc$)1\mathrm{.}2$ cmd$)3\mathrm{.}5$ cm$22.$ What is the speed when it returns to its equilibrium position?a$)0$ cm$/$sb$)37$ cm$/$s c$)75$ cm$/$sd$)4$ cm$/$s$24.$ If the mass were doubled, which of the following would be true?a$)$ Its amplitude would increaseb$)$ Its amplitude would decreasec$)$ Its period would increased$)$ Its period would decrease