Current Attempt in Progress

A worker pushed a $15\mathrm{.}0kg$ block $14\mathrm{.}0m$ along a level floor at constant speed with a force directed $29\mathrm{.}0$ below the horizontal. If the coefficient of kinetic friction between block and floor was $0\mathrm{.}210,$ 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