Can you show me how to answer this step by step.
A hiker leaves camp at 8 am on level terrain. At 9 am she is 5 km east of her starting point. At 10 am she is 2 km northeast (450 N of E) of where she was at 9am. At 11 am she is 5 km north of where she was at 10 am.
a) What is her displacement with respect to starting point?
b) What was her average velocity for the hike?