100 workers pull a 3 ton block to 100 m High using a ramp with a mechanical advantage of 4. With each Keys each worker diss 50 J of network

Why does lightning travel from clouds to the ground?

The ph is the a.independent variable b.the dependent variable c.control group

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.