A $650-$kg elevator starts from rest. It moves upward for $3\mathrm{.}00$ s with constant acceleration until it

reaches its cruising speed of $1\mathrm{.}75$ m$/$s$.($a$)$ What is the average power of the elevator motor during this

period? $($b$)$ How does this power compare with the motor power when the elevator moves at its

cruising speed