Question

2. An airplane taking off from a runway starts from rest and moves with constant acceleration
completing the run in one minute. If it takes off with a speed of 360 km/hr, find length of the
runway.
(A) 2.5 km
(B) 5.0 km
(C) 1.5 km
(D) 3.0 km​

Answer 1

Explanation:

intial velocity of plane 0

final velocity 360km/h

time=1/60hr

a=?

using Newton's first equation of motion

v=u+at

360=0+a*1/60

a=360*60km/h²

now using Newton's second equation of motion

s=ut+1/2at²

s=0+1/2*360*60*(1/60)²

s=3km

option (D)