An aeroplane accelerates from rest down a runaway at 3ms−2 for 30s until it finally lifts off the ground. Determine the distance travelled before take off.
A
1350m
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B
1620m
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C
1700m
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D
1482m
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Solution
The correct option is A1350m Given: Initially the aeroplane is at rest. Therefore, initial velocity: u=0ms−1. Acceleration: a=3ms−2 Time taken, t=30s
Let the distance travelled be s.
Using the second equation of motion: s=ut+12at2, s=0×30+(12×3×302) s=1350m