5. A boat travels upstream at a speed of 15 m/s when the engine suddenly shuts off. It then takes 2 minutes for the boat to move downstream with a speed of 5 m/s. What is the acceleration caused by the river and
what is the boat's displacement after 2 minutes?

What are igneous intrusions and extrusions

15. give an example for some particles or waves that are moving faster than light in everyday life 16. what is a laser? 17. what is an oscilloscope? 18. what does it means practically that nothing is faster than light in vacuum? 19. what is vacuum?

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k