a 2.0 kg mass is moving on a frictionless airtrack, it collides into a motionless 1.5 kg mass, what is the combined speed of the two masses if they stick together on impact

We found the centripetal acceleration of the earth as it revolves around the sun. compute the centripetal acceleration of a point on the surface of the earth at the equator caused by the rotation of the earth about its axis. (enter the magnitude. the radius of the earth is 6,371 km.)

An airplane flies eastward and always accelerates at a constant rate. at one position along its path it has a velocity of 34.3 m/s, it then flies a further distance of 40100 m and afterwards its velocity is 47.5 m/s. find the airplane\'s acceleration and calculate how much time elapses while the airplane covers those 40100 m.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration