PLEASE HELP I WILL GIVE THE BRAINIEST TO WHOEVER ANSWERS!!!
1. A force acting on an object does no work if

Aa machine is used to move the object

Bthe force is not in the direction of the objects motion

Cthe force is greater than the friction of motion

Dthe object accelerates

1. A 120-meter long ski lift carries skiers from a station at the foot of a slope to a second station 40 m above. what is is the IMA (ideal mechanical advantage) of the lift?
   

A.0.3

B.3

C40

D160

1. A mechanical device requires 420 j of work to do 230 j of work in lifting a crate. what is the efficiency of the device?
   

A0.5%

B190%

C55%

D183%