Question

12. Cuál es la velocidad inicial de un tren si después de haber recorrido20 metros a una aceleración de 4 m/s2 alcanzó una velocidad de 164 m/s

Answer 1

163.5m/s

Explanation:

Given the following

distance travelled = 20metres

acceleration = 4m/s^2

final velocity = 164m/s

Required

Initial velocity u

Using the equation of motion

v^2 = u^2 + 2aS

Substitute

164^2 = u^2 + 2(4)(20)

26,896 = u^2 + 160

u^2 = 26,896 - 160

u^2 = 27,736

u = √27,736

u = 163.5m/s

Hence the initial velocity is 163.5m/s