12. A man pushes a box of 40 kg up incline of 15°, if the man applies a horizontal force 200N and the box moves up the plane a distance of 20 m at a constant velocity and the
coefficient of friction is 0.10, find a work done by the man on the box, b. work done
against friction

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit