Answer:
10 seconds
Step-by-step explanation:
420 divided by 42 is 10 and its says 42 ft per sec so 10 seconds
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Answer:
17.25
Step-by-step explanation:
5/100 x 345 = 1725/100 = 17.25
Note that height is equal to 0 when time equals 0 and when time equals 4, but we are only concerned with time equal to 4