A plane inclined at an angle of 30° to the horizontal has an efficiency of 60%.the force parallel to the plane required to push a load of 120n uniformly up the plane is

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.