Question

My Notes

A motorist drives south at 20.0 m/s for 3.00 min, then turns west and travels at 25.0 m/s for 2.40 min, and finally travels northwest at 30.0 m/s for 1.00 min. For this 6.40 min trip, find the following values.

(a) total vector displacement

m (magnitude) ° south of west

(b) average speed

m/s

(c) average velocity

m/s (magnitude) ° south of west

Answer #1

A car is traveling west at 22.5 m/s when it turns due south and
accelerates to 25.0 m/s, all during a time of 8.00 s. Calculate the
magnitude of the car's average acceleration (in
m/s2).

2.00-kg block A traveling east at 20.0 m/s collides with 3.00-kg
block B traveling west at 10.0 m/s. After the collision, block A
has a velocity of 5.00 m/s due west. (a) How much kinetic energy
was lost during the collision? (b) If the blocks were in contact
for 75 ms, determine the magnitude and direction of average force
exerted on block A.

1) A speedboat increases its speed uniformly from vi = 20.0 m/s
to vf = 36.0 m/s in a distance of Δx = 2.40 ✕ 102 m.
(a) Draw a coordinate system for this situation and label the
relevant quantities, including vectors.
(b) For the given information, what single equation is most
appropriate for finding the acceleration? vf = vi + at a = vf − vi
tf − ti Δx = vit + 1 2 at2 vf2 = vi2...

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