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kx250f341
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A car travels east at 73 km/h for 1.4 h. It then travels 30.0° east of north at 129 km/h for 0.5 h.
(a) What is the average speed for the trip?
87.7 km/h
(b) What is the average velocity for the trip?
Magnitude ____ km/h
Direction ____
V avg= delta r/delta t
delta r= rf-ri/tf-ti
64.5km-102.2km=-37.8km
.5h-1.4h=-.9h
(-37.8km)/(-.9h)=42.1 km/h
not sure how to find the direction, but I am doing my h.w. online and it tells me my answer is incorrect. Am I even going in the right direction?
Any help please?
(a) What is the average speed for the trip?
87.7 km/h
(b) What is the average velocity for the trip?
Magnitude ____ km/h
Direction ____
Homework Equations
V avg= delta r/delta t
delta r= rf-ri/tf-ti
The Attempt at a Solution
64.5km-102.2km=-37.8km
.5h-1.4h=-.9h
(-37.8km)/(-.9h)=42.1 km/h
not sure how to find the direction, but I am doing my h.w. online and it tells me my answer is incorrect. Am I even going in the right direction?
Any help please?