Question

if a train is accelerating at a rate of 3.0 km/hr/s and its initial velocity is 20 km/hr, what is it velocity after 30 seconds?

Answer 1

Acceleration rate = (3 km/hr)/sec =

(3 km/3,600 sec)/sec =

(1 km/1,200 sec)/sec

Initial velocity= 20 km/hr =

20 km/3,600 sec = 1 km/180 sec

(1/180) + (1/1,200)(30) = 11/360 km/sec

= 110 km/3,600 sec = 110 km/h