a)
F = net braking force acting on jetliner = - 7.25 x 10⁵ N (the negative sign indicates that the braking force acts to slow down the motion.)
m = mass of the jetliner = 3.50 x 10⁵ N
a = acceleration of the jetliner
acceleration of the jetliner is given as
a = F/m
a = (- 7.25 x 10⁵)/(3.50 x 10⁵)
a = - 2.1 m/s²
t = time interval = 10 s
v₀ = initial velocity of jetliner = 75 m/s
v = final velocity after time "t" = ?
Using the kinematics equation
v = v₀ + at
v = 75 + (- 2.1) (10)
v = 54 m/s
b)
x = distance traveled in time "t"
using the kinematics equation
x = v₀ t + (0.5) at²
inserting the values
x = (75) (10) + (0.5) (- 2.1) (10)²
x = 645 m
