Fnet = ma => -0.2 = (0.03) a => a = .....

Now apply the usual formulae for straight line motion under constant acceleration, using the data:

a) u = 10km/hr = .... m/s (you know why the conversion from km/hr to m/s is required and how to do it, right?)

v = 0 m/s

a = ...

t = ?

b) u = 10km/hr = .... m/s

v = 0 m/s

a = ...

x = ?