Suppose it takes 500 years to form 2 cm of new soil without erosion. of a farmer need at least 35 cm of soil to plant a particular crop, how many years will the farmer need to wait before planting his or her crop? show how you get to the answer.?

What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.

How is the ideal mechanical advantage of a wheel and axle calculated?