Question

a moving train is brought to rest within 20 seconds by applying brakes find the initial velocity if the retardation due to application of brakes is 1.5m per second square​

Answer 1

Answer:

Answer. => u = 40 m/s .

Step-by-step explanation:

Given:

Final velocity v = 0

Time taken t = 20 s

Acceleration a = -2 m/s2

From the equation v = u + at, we have

u = v - at

→ u = 0 - (-2) × 20

→ u = 40 m/s2