Calculate what specifically? I'll try to help out though!
Assuming no friction...
Fnet = m(a)
Fnet/m = a
35/25= 1.4 m/s^2 = a
Finding final velocity...
V1 = 0 m/s
a = 1.4 m/s^2
d = 1.5 m
V2 = ?
V1^2 = V2^2 + 2(a)(d)
0 = V2^2 + 2(a)(d)
2(a)(d) = V2^2
√2(a)(d) = V2
√2(1.4)(1.5) = V2
2.05 m/s = V2
