1. Calculate the acceleration:

* Acceleration (a) = (Final velocity (v) - Initial velocity (u)) / Time (t)

* a = (85 m/s - 35 m/s) / 20 s

* a = 2.5 m/s²

2. Calculate the force:

* Force (F) = Mass (m) x Acceleration (a)

* F = 148 kg x 2.5 m/s²

* F = 370 N (Newtons)

Therefore, the force on the object is 370 Newtons.