Question

A jet plane starts from rest with an acceleration of 3ms-2 and makes a run for 35s before taking off. What is the minimum length of the runway and what is the velocity of the jet at take off?
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hi ji

Answer 1

Given :

Initial velocity (u) = 0m/s

Time taken (t) = 35s

 

To find :

Distance (s)

Final velocity (v)

Formula used:

S = ut + 1/2 × at²

v = u + at

Solution :

S = 0(35) + 1/2 × 3(35)²  

S = 0 + 1/2 × 3(1225)  

S = 0 + 1/2 × 3675  

∴ S = 1837.5 meters

___________________

v = u + at  

v = 0 + 3(35)  

∴ v = 105 m/s