Aball sitting on the top of a table has potential energy but no kinetic energy.
how do potential and kinetic energy change as the ball falls off the table to the floor?
a.
its potential energy increases, and its kinetic energy decreases.
b.
its potential energy decreases, and its kinetic energy increases.
c.
both its potential energy and its kinetic energy increase.
d.
both its potential energy and its kinetic energy decrease.

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

As part of your daily workout, you lie on your back and push with your feet against a platform attached to two stiff springs arranged side by side so that they are parallel to each other. when you push the platform, you compress the springs. you do an amount of work of 79.0 j when you compress the springs a distance of 0.230 m from their uncompressed length. (a) what magnitude of force must you apply to hold the platform in this position? (b)how much additional work must you do to move the platform a distance 0.230 m farther? (c) what maximum force must you apply to move the platform a distance 0.230 m farther?

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.