You're asking about the force needed to accelerate an object, but you're missing some crucial information: the acceleration itself.

Here's why:

* Newton's Second Law: The relationship between force, mass, and acceleration is described by Newton's Second Law of Motion: F = ma

* F is the force (measured in Newtons, N)

* m is the mass (measured in kilograms, kg)

* a is the acceleration (measured in meters per second squared, m/s²)

To calculate the force, you need to know the acceleration of the object.

Here's how you can get the information you need:

1. What is the object's final velocity at 0.75 hours? Knowing this, and the initial velocity (which is likely 0), you can calculate the acceleration.

2. Do you have a graph of velocity vs. time? The slope of this graph will give you the acceleration.

3. Do you know the distance the object travels in this time interval? You could use kinematic equations to calculate the acceleration, but this requires knowing the initial velocity.

Example:

Let's say the object's final velocity after 0.75 hours is 20 m/s. Here's how you'd calculate the force:

1. Calculate acceleration:

* Time = 0.75 hours = 2700 seconds

* Initial velocity (v₀) = 0 m/s

* Final velocity (v) = 20 m/s

* Acceleration (a) = (v - v₀) / t = (20 - 0) / 2700 = 0.0074 m/s²

2. Calculate force:

* Force (F) = ma = 120000 kg * 0.0074 m/s² = 888 N

Please provide the missing information about the acceleration, and I can help you calculate the force.