Question

A train accelerates at a rate of 2 Km/hr/sec for a period of 30 seconds. If its initial speed was 15 Km/hr, what will be its final speed?

Answer 1

a = Vf - vi / t

Where:

a = acceleration = 2 km/h/s

vf= final speed

vi= initial speed = 15 km/h

t= time = 30 sec

Isolate Vf

at = Vf- vi

at + vi = vf

Replacing:

vf = 2 km/h/s * 30s + 15 km/h

vf = 60 km/h + 15 km/h

Vf= 75 km/h