Many highways have a speed limit of 65 mi/h. What is this in km/h?

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1 km/h

A dog runs back and forth between its two owners, who are walking toward one another (Figure 2-25). The dog starts running when the owners are d = 9.0 m apart. If the dog runs with a speed of v_d = 3.2 m/s, and the owners each walk with a speed of 1.3 m/s, how far has the dog traveled when the owners meet?

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1 m

Figure 2-25

In its daily prowl of the neighborhood, a cat makes a displacement of 115 m due north, followed by a 68 m displacement due west. Find the magnitude and direction of the displacement required for the cat to return home.

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1 m

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2° south of east

Playing shortstop, you pick up a ground ball and throw it to second base. The ball is thrown horizontally, with a speed of 16 m/s, directly toward point A (Figure 4-15). When the ball reaches the second baseman 0.35 s later, it is caught at point B.

Figure 4-15

(a) How far were you from the second baseman?

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1 m
(b) What is the distance of vertical drop, AB?

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2 m

Driving home from school one day you spot a ball rolling out into the street (Figure 5-18). You brake for 1.00 s, slowing your 1050 kg car from 16.0 m/s to 9.50 m/s.

Figure 5-18

(a) What was the average force exerted on your car during braking?
Magnitude

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1 kN
Direction

2

backward forward    

(b) How far did you travel while braking?

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3 m