Alice thinks that she is the president's illegitimate daughter, and she often hears him talking to herAlice is probably suffering from

What happens to light waves from a star as the star moves away from earth?

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?