We use long ramps at the back of our school. explain what using the ramps does to the effort force you would need to move a big box of books from the ground to the door. explain the trade-off involved.

With i really need the correct answer!

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33

Akg a of 55 m at an of 11 ? . if is at 98 km/h, be ?