What I have seen myself. They report that they are so huge and bulky that one of them can pounce on an elephant and carry it up to a great height in the air. Then it lets go, so that the elephant drops to earth and is smashed to pulp, whereupon the gryphon bird perches on the carcass and feeds at its ease. They add that they have a wing-span of thirty paces and their wing-feathers are twelve paces long and of a thickness proportionate to their length. What I have seen myself I will tell you elsewhere, since that fits in better with the plan of the book. What impresses Marco Polo most about the island of Zanzibar?
A. the availability of golden cloth
B. the number of rulers of sheikhs
C. the variety of animals
D. the difficulty in sailing south of the island
Answer (3)
The time the ball takes to fall 9.5 meters is the square root of (19/g), where g is gravitational acceleration. The time it takes to rise to 5.7 meters is the square root of (11.4/g), for the same value of g. The time it takes to fall from 5.7 meters to 1.2 is the square root of (9/g). So the answer is [sqrt(19)+sqrt(11.4)+sqrt(9)]/sqrt(g). If g=10, the answer is 3.39 seconds; if g=9.8, the answer is 3.43 seconds.
Answer: 3.4s ;
The total time the golf ball is in the air, from drop to catch, is approximately 3.4 seconds. This includes the time taken to fall, rise, and then fall again before being caught. Each stage of motion was analyzed separately to calculate the overall time.
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