What does the minimum work factor of a metal have to be for visible light (380-750 nm) to eject photoelectrons?​

It can take some of those large , industrial vehicles up to feet to stop when traveling only 60 mph, and therefore , you shoukd be mindful to not be jn the traffic right in front of them a. 100 feet b. 200 feet c. 335 feet d. 425 feet

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not