Current Attempt in Progress

A worker pushed a $24\mathrm{.}0$ kg block $9\mathrm{.}80$ m along a level floor at constant speed with a force directed $25\mathrm{.}0$ below the horizontal. If the coefficient of kinetic friction between block and floor was $0\mathrm{.}290,$ what were $($a$)$ the work done by the worker's force and $($b$)$ the increase in thermal energy of the block$-$floor system?

$($a$)$ Number $$ Units $$

$($b$)$ Number $$ Units $$