a) name some advantages of moving an object up a ramp instea

a) name some advantages of moving an object up a ramp instead of lifting it vertically upward
b) since nature is not in the habit of giving us something for nothing,name some disadvantages of moving an object up a ramp instead of lifting it vertically upward
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a)The most important advantage is that we can use a smaller force to move it by a ramp than to lift it vertically.(最重要的优点在于利用斜坡我们可以用更小的力.)b)The most important disadvantage is that...

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