WA 13 (415918)

1. The fastest recorded pitch in Major League Baseball, thrown by Nolan Ryan in 1974, was clocked at 162.3 km/h (100.8 mi/h). If a pitch were thrown horizontally with this velocity, how far would the ball fall vertically by the time it reached home plate, 18.3 m (60.0 ft) away? [0.809] m(see Ch. 2, P 34)

2. A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 16 m/s. The cliff is h = 48 m above the water's surface. How long does it take for the stone to fall to the water? [3.13] s With what speed does it strike the water? [34.6] m/s

Figure 3.28

3. A spy in a speed boat is being chased down a river by government officials in a larger craft. If the spy travels at 23 m/s and the officials travel at a speed of 17 m/s, how far from each other will the two vessels land after they fly off a 5.0 m waterfall? [6.06] m

(see Ch. 2, P 36)

wa13_answers Friday, October 20, 200610:55 PM

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4. A ball is projected horizontally from the edge of a table that is 1.15 m high, and it strikes the floor at a point 1.40 m from the base of the table. (a) What is the initial speed of the ball? [2.89] m/s

(b) How high is the ball above the floor when its velocity vector makes a 45.0° angle with the horizontal? [0.724] m

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