An 85 kg linebacker is running at 8 m/s directly toward the sideline of a football field. he tackles a 75 kg running back moving at 9 m/s straight toward the goal line (perpendicular to the original direction of the linebacker.) as a result of the collision both players momentarily leave the ground. determine their common speed and direction immediately after they collide.

i know the answer is 6.0 m/s and 45 degrees toward the sidelines from the running backs' original path. i don't understand how to do this problem. show all work and how to get this answer.

Which is the best predictor of the radioactive nature of an isotope? o the proton-to-electron ratio the neutron-to-proton ratio o the neutron-to-electron ratio the electron-to-proton ratio

One object has a mass of 1 kg and another object has a mass of 3 kg. if the speeds are the same, which of the following is true about their kinetic energy?

Asatellite that goes around the earth once every 24 hours iscalled a geosynchronous satellite. if a geosynchronoussatellite is in an equatorial orbit, its position appearsstationary with respect to a ground station, and it is known as ageostationary satellite find the radius rof the orbit of a geosynchronous satellite that circles the earth.(note that ris measured from the center of the earth, not the surface.) you mayuse the following constants: the universal gravitational constant g is 6.67 \times 10^{-11}\; {\rm n \; m^2 / kg^2}. the mass of the earth is 5.98 \times 10^{24}\; {\rm kg}. the radius of the earth is 6.38 \times 10^{6}\; {\rm m}.