A 100-m long ski lift carries skiers from a station at the foot of a slope to a second station 40 m above. What is the IMA of the lift?
40

Explanation:

The ideal mechanical advantage of a slope is given by the ratio between the output load, which is simply the weight of the object (Fw), and the input force Fi applied to move the object along the slope:

ima= {Fw}÷{Fi},

The energy conservation law states that the potential energy of the object when it reaches the final height h is equal to the work done to move the object along the distance of the slope ll , i.e.

Fw h = Fi L

From this we find

{Fw}÷{Fi} = {L}÷{h}

Therefore, we can substitute this into the formula of the ideal mechanical advantage and calculate its value:

ima= {L}÷{h} = {100m}÷{40m}=2.5

a=d/t

a="triangle"v/t

explanation:

a = acceleration

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me