Brad rides his bike 20 km. he covers the distance in 45 minutes (0.75 hours). what is his speed in kilometers per hour? a.15 km/hr b.27 km/hr c.44 km/hr d.9.0 km/hr

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

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp

The force needed to overcome static friction is usually less than that needed to overcome kinetic friction.true or false?