A golf ball is thrown upward with a velocity of 3.87 m/s, the golf ball hits the surface of earth with a velocity of -22.35 m/s, how long was the ball in the air?

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

What practical value did astronomy offer to ancient civilizations?