What is the speed of a person travelling 30 meters in 5 seconds?

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

In a good thermo flask the main cause of heat loss is