While you're in a bus that moves at 100 km/h, you walk from the back to the front at 10 km/h. what is your speed relative to the road outside?
a) 90 km/h
b) 110 km/h
c) 100 km/h
d) 10 km/h

(B) 110 km/h

Explanation:

Since you are moving in the same direction as the bus and you are on the bus, your speed relative to the road will be the addition of the speed of the bus and the speed you are walking at.

Therefore your speed relative to the bus outside = 100 + 10 = 110 km/h

resonant frequency

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.