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Derivation of Position-Time Relation by Graphical Method

A plane start...

Question

A plane starting at rest at one end of a runway undergoes a uniform acceleration of $4.8 m / s^{2}$ for $15 s$ before take-off. What is its speed of takeoff?

A

4.8 m / s

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B

1080 m / s

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C

72 m / s

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D

48 m / s

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Solution

The correct option is C $72 m / s$
Using v=u+at⇒v=0+4.8×15⇒v=72m/s

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