A tennis ball is tossed straight up from the ground and allowed to fall back to the ground. Ignoring air resistance, explain how the vertical velocity changes throughout the tennis ball's flight.

Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? assume that the earth–moon (center-to-center) distance is 3.82 × 10^8 m, earth's radius is 6.37 × 10^6 m, moon's mass is 7.36 × 10^22 kg, and earth's mass is 5.98 × 10^24 kg.

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Work = force × a. work b. energy c. distance d. momentum