The initial velocity, the final velocity, and the time are given. Using one of the equations of kinematics, you can calculate the displacement directly.

Question

An airplane starts from rest and reaches a takeoff velocity of 60.0 m/s due north in 4.0 s. How far has it traveled before takeoff?

A. 60 m, due north
B. 30 m, due north
C. 240 m, due north
D. 360 m, due north
E. 120 m, due north

Answer 1

The answer is E

Using the equation d= v1*t+1/2at^2

Answer 2

V2 = V1 + a*t.
60 = 0 + a*4, a = 15 m/s^2.

d = V1*t + 0.5a*t^2.
V1 = 0, t = 4 s., a = 15 m/s^2, d = ?.