ling A pitching machine is programmed to pitch baseballs horizontally at a speed
ID: 1265897 • Letter: L
Question
ling A pitching machine is programmed to pitch baseballs horizontally at a speed of 79 mph. The machine is mounted on a truck and aimed forward. As the truck drives toward you at a speed of 45 mph, the machine shoots a ball toward you. For each of the object pairings listed below, determine the correct relative speed The speed of the The speed of the The speed of the The s d of the pitching machine pitched ball relative pitching machine pitched ball relative to you relative to the truck to the truck relative to you 160 mph 113 mph zero 45 mph 124 mph 79 mph 34 mphExplanation / Answer
since the machine is kept on the truck so,
the speed of the pitching machine relative to the truck = 0 mph
the speed of the pitched ball relative to the truck = 79 mph
the speed of the pitching machine relative to the you =speed of the truck
the speed of the pitching machine relative to the you = 45 mph
the speed of the pitched ball relative to the you = speed of truck + speed of ball relative to truck
the speed of the pitched ball relative to the you = 45 + 79
the speed of the pitched ball relative to the you = 124 mph
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