In which of the following cases is work being done on an object? question 2 options: pulling a trailer up a hill carrying a box down a corridor suspending a heavy weight with a strong chain pushing against a locked door

Work is done when a force acts on an object AND the object moves in the direction of the force.

-- Pulling a trailer up a hill.  YES. The trailer is moving in the direction of the pulling force.  

-- Carrying a box down a corridor.  No. The box is not moving in the direction of gravity (down) OR in the direction of your arm (down the corridor).

-- Suspending a heavy weight with a strong chain,  No.  There's a force (gravity) acting on the weight, but the weight is not moving at all.

-- Pushing against a locked door.  No.  There's a force (your muscles) acting on the door, but he door is not moving at all.

elctricity and magnet is conversion to it

1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//