Suppose that a 110 kg football player running at 7.5 m/s catches a 0.47 kg ball moving at a speed of 23.5 m/s with his feet off the ground, while both of them are moving horizontally. Final speed = 7.44 m/s
Calculate the change in kinetic energy of the system, in joules, in this case.

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b. refraction c. diffraction d. interference

Asmall object with mass 0.200 kg swings back and forth on the lower end of a light rope that is 3.00 m long. the upper end of the rope is attached to the ceiling. as the object swings through its lowest position, where the rope is vertical, the speed of the object is 5.80 m/s. at this point in the motion, what is the tension in the rope? (use g = 9.80 m/s2.)

More solar radiation is absorbed by earth’s surface than by