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Question

An aeroplane accelerates from rest down a runaway at 3 ms2 for 30 s until it finally lifts off the ground. Determine the distance travelled before take off.

A
1350 m
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B
1620 m
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C
1700 m
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D
1482 m
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Solution

The correct option is A 1350 m
Given:
Initially the aeroplane is at rest. Therefore, initial velocity:
u=0 ms1.
Acceleration: a=3 ms2
Time taken, t=30 s

Let the distance travelled be s.

Using the second equation of motion:
s=ut+12at2,
s=0×30+(12×3×302)
s=1350 m

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