5. The runway on which a 65.1 m plane lands, inte another runway. The width of t

Question

5. The runway on which a 65.1 m plane lands, inte another runway. The width of the intersection is 32.0 m. The plane slows down through the intersection at a rate of with speed of 45.0 How much time is needed for the plane to the intersection? E)2.63 s D) 1.92 s C) 0.54 s B) 54.7 s 1.700 s 6. The position of a particle is given by x(n 7.8m (9.2ml sy-2.1ml s y'.what is true about the particle? A The acceleration is constant BThe velocityis constant. The partcle is at the origin at O D The velocity is not constant but acceleration is constant. e)The acceleration is not constant.

Explanation / Answer

here,

deaccelration , a = - 5.7 m/s^2

final speed , v = 45 m/s

s = 65.1 + 32 m = 97.1 m

using third equation

v^2 - u^2 = 2 * a * s

45^2 - u^2 = - 2 * 5.7 * 97.1

u = 55.96 m/s

let the time taken be t

v = u + a * t

45 = 55.96 - 5.7 * t

t = 1.92 s

the time taken is D) 1.92 s

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