Two separate masses on two separate springs undergo simple harmonic motion indefinitely $($the surface is frictionless$).$ In CASE $1,$ the spring constant is $2$k$,$ the mass is m$,$ and the spring oscillates with amplitude d$.$ In CASE $2,$ the spring constant is $2$k$,$ the mass is $2$m$,$ and the spring oscillates with amplitude $2$d$.$

$1)$

Compare the maximum force on the mass in each case: