Answer
(a) 1150 joules
(b) 6000 joules
Work Step by Step
(a) Since the velocity is constant, the applied force is equal in magnitude to the frictional force.
Therefore,
Work = Force x Distance
becomes
$Work = F_f\times d$
Next, we find the amount of work using the above formula:
$Work = F_f\times d$
$Work = (230)(5.0)$
$Work = 1150 ~joules$
(b) Since the velocity is constant, the applied force is equal in magnitude to the gravitational force. Therefore,
Work = Force x Distance
$Work = F_g\times d$
$Work = (1200)(5.0)$
$Work = 6000 ~joules$