1. An electric train initially moving at 25km/h accelerates to 35km/h in 20s. Find its average acceleration in m/s^2. G: v1 = 25km/h v2 = 35km/h Delta t = 20s R: Aav 2. Aav=(v2-v1)/delta t 3. = (35km/h-25km/h)-20s The problem is that the velocities are in km per hour and the change in time is seconds. Do I just continue on with the question as is? Or if I had to convert the velocities to m/s how would i do so to divide with the 20s so that i may end up with a = m/s^2 ?