Abullet travels at 850 m/s how long will it take a bullet to go 1 km

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?

The diagram shows a boulder rolling down a hill into a valley and then up the opposite hill. at which position does the boulder have the greatest kinetic energy? ab c d