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Question

A plane has a takeoff speed of 88.3m/s and requires 1365m to reach that speed. Determine the time required to reach this speed.

A
20.8s
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B
30.s
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C
30.8s
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D
40.8s
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Solution

The correct option is B 30.8s
Given, initial velocity is u=0m/s
Final velocity is v=88.3m/s and traveled distance, d=1365m
Let a be the acceleration of the plane.
Using v2u2=2ad
(88.3)202=2a(1365)
a=2.86m/s2
If t be the required time.
Using v=u+at,
88.3=0+2.86t
t=88.3/2.86=30.8s

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