A cart starts from position 4 in the figure below with a velocity of 15 m/s to the left. Find the speed with which the cart reaches positions 1, 2, and 3. Neglect friction
4
2
3
20.0 m
25.0 m
10.0 m

The earth remains in orbit around the sun due to the force of gravity. how does the force of gravity exerted by the sun on the earth compare to the force of gravity exerted by the earth on the sun?

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?

Explain why electric current cannot exist if a current doesn't have a voltage source.