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What is the average acceleration of a care that goes from rest to 60 mph in 7 seconds in feet per second?
Wiki User
∙ 12y ago
the car goes from 0 miles in an hour to 60 miles in an hour over 7 seconds
this can be changed to minuets (60 minuets in an hour)
the car goes from 0 miles in a minuet to 1 mile in a minuet over 7 seconds
this can be changed to seconds (60 seconds in a minuet)
the car goes from 0 miles in a second to 1/60 miles in a minuet over 7 seconds
which then can be changed to feet (5280 feet in a mile)
the car goes from 0 feet in a second to 5280/60 feet in a second over 7 seconds
this can be simplified
the car goes from 0 feet in a second to 88 feet in a second over 7 seconds
now lets divide everything by 7
the car goes from 0 feet in a second to 12.57 feet in a second over 1 seconds
so are answer is...
the car accelerate from 0 to 12.57 feet per second in 1 second
Wiki User
∙ 12y ago
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What is the acceleration for a 1000 kg rocket launched that accelerates for 17 seconds then stops accelerating and ends up 4700 meters in the air at 21 seconds?
-- The rocket's initial speed was zero.-- In 21 seconds, it traveled 4,700 meters.-- Its average speed was 4,700/21 meters per second.-- Since that was its average speed, and its initial speed was zero, its final speedmust have been double that = 9,400/21 meters per second.-- Acceleration = (change in speed) / (time for the change)= (9,400/21) divided by (21) = 21.315 meters per second2 .==================================Or you could just use the formula [ D = 1/2 A T2 ] .4,700 = 1/2 A (21)29,400 = A (21)2A = 9,400 / 212 = 21.315 meters per second2Notice that we don't care wherther ther mass of the rocket is 1 milligram,1,000 kg, or a bazillion metric tons. Makes no difference.
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