Amoving van travels 10km north, then 4 km east, drops off some furniture and then drives 8 km south. (a) sketch the path of the moving van. (2) how far is the van from its starting point? (hint: it is the magnitude of the displacement vector).

4.47 km

Explanation:

If we draw the path of the van then we get a shape with two exposed points A and D. If we draw a line from point D perpendicular to BA we get point E. This gives us a right angled triangle ADE.

From Pythagoras theorem

AD² = AE² + ED²

Hence, the van is 4.47 km from its initial point

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it