Question

A person is moving in the positive and negative directions, as shown below. What is their instantaneous velocity at 2 s?

A) 1.0 m/s

B) 1.5 m/s

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>Explain WHY

Question 2) A runner from Spain is competing in the Seattle Marathon. The race marks the distance in miles, however she is used to the metric system. If 1 mile = 1.609 km, a marathon is 26.2 miles, and she completes the race in 5 hours, At what time after the start of the race will the runner have to run 10 km?

A) 71 minutes

B) 101 minutes

>>>>>>>>>>>>>>>>>>EXPALIN WHY

Question 3)

You take a walk for 20 km in a direction 15o North of East, then another walk for 40 km in a direction 30o North of West. Using the convention that North is +y and East is +x, what is the total displacement in the x direction from your walk?

A) Rx = 0.68 km

B) Rx = -15.32 km

>>>>>>>>>>>>>>>>>>>>>EXPLAIN WHY

Answer 1

solving 2nd question as figure is not there for 1st question'

26.2 miles=42.1558 km

so 42.1558 km is run in =5 hours=300 min

10 km will be run in=(300/42.1558)*10=71 min