A stone is thrown vertically downward with a speed of 10.0 m/s from a bridge. Accelerating under gravity (9.8 m/s²), the stone strikes the water 1.8 s later. From what height above the water was the stone thrown?

	15 m
	27 m
	50 m
	34 m

An airplane flies 5.0 km [S] and then 12 km [E]. To return to its starting point, what displacement is needed?

	13 km [W 23 N]
	17 km [W 23 N]
	13 km [E 23 S]
	17 km [E 23 S]

An object was displaced 3.0 m [N] and then 4.0 m [W]. What was total displacement of the object?

	5.0 m [W 53 N]
	5.0 m [W 37 N]
	7.0 m [W 53 N]
	7.0 m [W 37 N]