A train starts from rest with an accelaration of 0.5 m/s (square) find its speed in km/h when it has moved throug 100m

Answer 1

V^2 = Vo^2 + 2a*d = 0 + 2*0.5*100 = 100.
V = 10 m/s.

V=10m/s * 1km/1000m * 3600s/h = 36 km/h.